if(Object.isUndefined(Effect))
throw("dragdrop.js requires including script.aculo.us' effects.js library");var Droppables = {drops: [],remove: function(element) {this.drops = this.drops.reject(function(d) { return d.element==$(element) });},add: function(element) {element = $(element);var options = Object.extend({greedy:     true,hoverclass: null,tree:       false
}, arguments[1] || { });if(options.containment) {options._containers = [];var containment = options.containment;if(Object.isArray(containment)) {containment.each( function(c) { options._containers.push($(c)) });} else {options._containers.push($(containment));}
}
if(options.accept) options.accept = [options.accept].flatten();Element.makePositioned(element);options.element = element;this.drops.push(options);},findDeepestChild: function(drops) {deepest = drops[0];for (i = 1; i < drops.length; ++i)
if (Element.isParent(drops[i].element, deepest.element))
deepest = drops[i];return deepest;},isContained: function(element, drop) {var containmentNode;if(drop.tree) {containmentNode = element.treeNode;} else {containmentNode = element.parentNode;}
return drop._containers.detect(function(c) { return containmentNode == c });},isAffected: function(point, element, drop) {return (
(drop.element!=element) &&
((!drop._containers) ||
this.isContained(element, drop)) &&
((!drop.accept) ||
(Element.classNames(element).detect( 
function(v) { return drop.accept.include(v) } ) )) &&
Position.within(drop.element, point[0], point[1]) );},deactivate: function(drop) {if(drop.hoverclass)
Element.removeClassName(drop.element, drop.hoverclass);this.last_active = null;},activate: function(drop) {if(drop.hoverclass)
Element.addClassName(drop.element, drop.hoverclass);this.last_active = drop;},show: function(point, element) {if(!this.drops.length) return;var drop, affected = [];this.drops.each( function(drop) {if(Droppables.isAffected(point, element, drop))
affected.push(drop);});if(affected.length>0)
drop = Droppables.findDeepestChild(affected);if(this.last_active && this.last_active != drop) this.deactivate(this.last_active);if (drop) {Position.within(drop.element, point[0], point[1]);if(drop.onHover)
drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element));if (drop != this.last_active) Droppables.activate(drop);}
},fire: function(event, element) {if(!this.last_active) return;Position.prepare();if (this.isAffected([Event.pointerX(event), Event.pointerY(event)], element, this.last_active))
if (this.last_active.onDrop) {this.last_active.onDrop(element, this.last_active.element, event);return true;}
},reset: function() {if(this.last_active)
this.deactivate(this.last_active);}
}
var Draggables = {drags: [],observers: [],register: function(draggable) {if(this.drags.length == 0) {this.eventMouseUp   = this.endDrag.bindAsEventListener(this);this.eventMouseMove = this.updateDrag.bindAsEventListener(this);this.eventKeypress  = this.keyPress.bindAsEventListener(this);Event.observe(document, "mouseup", this.eventMouseUp);Event.observe(document, "mousemove", this.eventMouseMove);Event.observe(document, "keypress", this.eventKeypress);}
this.drags.push(draggable);},unregister: function(draggable) {this.drags = this.drags.reject(function(d) { return d==draggable });if(this.drags.length == 0) {Event.stopObserving(document, "mouseup", this.eventMouseUp);Event.stopObserving(document, "mousemove", this.eventMouseMove);Event.stopObserving(document, "keypress", this.eventKeypress);}
},activate: function(draggable) {if(draggable.options.delay) {this._timeout = setTimeout(function() {Draggables._timeout = null;window.focus();Draggables.activeDraggable = draggable;}.bind(this), draggable.options.delay);} else {window.focus();this.activeDraggable = draggable;}
},deactivate: function() {this.activeDraggable = null;},updateDrag: function(event) {if(!this.activeDraggable) return;var pointer = [Event.pointerX(event), Event.pointerY(event)];if(this._lastPointer && (this._lastPointer.inspect() == pointer.inspect())) return;this._lastPointer = pointer;this.activeDraggable.updateDrag(event, pointer);},endDrag: function(event) {if(this._timeout) {clearTimeout(this._timeout);this._timeout = null;}
if(!this.activeDraggable) return;this._lastPointer = null;this.activeDraggable.endDrag(event);this.activeDraggable = null;},keyPress: function(event) {if(this.activeDraggable)
this.activeDraggable.keyPress(event);},addObserver: function(observer) {this.observers.push(observer);this._cacheObserverCallbacks();},removeObserver: function(element) {  // element instead of observer fixes mem leaks
this.observers = this.observers.reject( function(o) { return o.element==element });this._cacheObserverCallbacks();},notify: function(eventName, draggable, event) {  // 'onStart', 'onEnd', 'onDrag'
if(this[eventName+'Count'] > 0)
this.observers.each( function(o) {if(o[eventName]) o[eventName](eventName, draggable, event);});if(draggable.options[eventName]) draggable.options[eventName](draggable, event);},_cacheObserverCallbacks: function() {['onStart','onEnd','onDrag'].each( function(eventName) {Draggables[eventName+'Count'] = Draggables.observers.select(
function(o) { return o[eventName]; }
).length;});}
}
var Draggable = Class.create({initialize: function(element) {var defaults = {handle: false,reverteffect: function(element, top_offset, left_offset) {var dur = Math.sqrt(Math.abs(top_offset^2)+Math.abs(left_offset^2))*0.02;new Effect.Move(element, { x: -left_offset, y: -top_offset, duration: dur,queue: {scope:'_draggable', position:'end'}
});},endeffect: function(element) {var toOpacity = Object.isNumber(element._opacity) ? element._opacity : 1.0;new Effect.Opacity(element, {duration:0.2, from:0.7, to:toOpacity,queue: {scope:'_draggable', position:'end'},afterFinish: function(){Draggable._dragging[element] = false 
}
});},zindex: 1000,revert: false,quiet: false,scroll: false,scrollSensitivity: 20,scrollSpeed: 15,snap: false,delay: 0
};if(!arguments[1] || Object.isUndefined(arguments[1].endeffect))
Object.extend(defaults, {starteffect: function(element) {element._opacity = Element.getOpacity(element);Draggable._dragging[element] = true;new Effect.Opacity(element, {duration:0.2, from:element._opacity, to:0.7});}
});var options = Object.extend(defaults, arguments[1] || { });this.element = $(element);if(options.handle && Object.isString(options.handle))
this.handle = this.element.down('.'+options.handle, 0);if(!this.handle) this.handle = $(options.handle);if(!this.handle) this.handle = this.element;if(options.scroll && !options.scroll.scrollTo && !options.scroll.outerHTML) {options.scroll = $(options.scroll);this._isScrollChild = Element.childOf(this.element, options.scroll);}
Element.makePositioned(this.element);this.options  = options;this.dragging = false;this.eventMouseDown = this.initDrag.bindAsEventListener(this);Event.observe(this.handle, "mousedown", this.eventMouseDown);Draggables.register(this);},destroy: function() {Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);Draggables.unregister(this);},currentDelta: function() {return([
parseInt(Element.getStyle(this.element,'left') || '0'),parseInt(Element.getStyle(this.element,'top') || '0')]);},initDrag: function(event) {if(!Object.isUndefined(Draggable._dragging[this.element]) &&
Draggable._dragging[this.element]) return;if(Event.isLeftClick(event)) {var src = Event.element(event);if((tag_name = src.tagName.toUpperCase()) && (
tag_name=='INPUT' ||
tag_name=='SELECT' ||
tag_name=='OPTION' ||
tag_name=='BUTTON' ||
tag_name=='TEXTAREA')) return;var pointer = [Event.pointerX(event), Event.pointerY(event)];var pos     = Position.cumulativeOffset(this.element);this.offset = [0,1].map( function(i) { return (pointer[i] - pos[i]) });Draggables.activate(this);Event.stop(event);}
},startDrag: function(event) {this.dragging = true;if(!this.delta)
this.delta = this.currentDelta();if(this.options.zindex) {this.originalZ = parseInt(Element.getStyle(this.element,'z-index') || 0);this.element.style.zIndex = this.options.zindex;}
if(this.options.ghosting) {this._clone = this.element.cloneNode(true);this.element._originallyAbsolute = (this.element.getStyle('position') == 'absolute');if (!this.element._originallyAbsolute)
Position.absolutize(this.element);this.element.parentNode.insertBefore(this._clone, this.element);}
if(this.options.scroll) {if (this.options.scroll == window) {var where = this._getWindowScroll(this.options.scroll);this.originalScrollLeft = where.left;this.originalScrollTop = where.top;} else {this.originalScrollLeft = this.options.scroll.scrollLeft;this.originalScrollTop = this.options.scroll.scrollTop;}
}
Draggables.notify('onStart', this, event);if(this.options.starteffect) this.options.starteffect(this.element);},updateDrag: function(event, pointer) {if(!this.dragging) this.startDrag(event);if(!this.options.quiet){Position.prepare();Droppables.show(pointer, this.element);}
Draggables.notify('onDrag', this, event);this.draw(pointer);if(this.options.change) this.options.change(this);if(this.options.scroll) {this.stopScrolling();var p;if (this.options.scroll == window) {with(this._getWindowScroll(this.options.scroll)) { p = [ left, top, left+width, top+height ]; }
} else {p = Position.page(this.options.scroll);p[0] += this.options.scroll.scrollLeft + Position.deltaX;p[1] += this.options.scroll.scrollTop + Position.deltaY;p.push(p[0]+this.options.scroll.offsetWidth);p.push(p[1]+this.options.scroll.offsetHeight);}
var speed = [0,0];if(pointer[0] < (p[0]+this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[0]+this.options.scrollSensitivity);if(pointer[1] < (p[1]+this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[1]+this.options.scrollSensitivity);if(pointer[0] > (p[2]-this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[2]-this.options.scrollSensitivity);if(pointer[1] > (p[3]-this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[3]-this.options.scrollSensitivity);this.startScrolling(speed);}
if(Prototype.Browser.WebKit) window.scrollBy(0,0);Event.stop(event);},finishDrag: function(event, success) {this.dragging = false;if(this.options.quiet){Position.prepare();var pointer = [Event.pointerX(event), Event.pointerY(event)];Droppables.show(pointer, this.element);}
if(this.options.ghosting) {if (!this.element._originallyAbsolute)
Position.relativize(this.element);delete this.element._originallyAbsolute;Element.remove(this._clone);this._clone = null;}
var dropped = false;if(success) {dropped = Droppables.fire(event, this.element);if (!dropped) dropped = false;}
if(dropped && this.options.onDropped) this.options.onDropped(this.element);Draggables.notify('onEnd', this, event);var revert = this.options.revert;if(revert && Object.isFunction(revert)) revert = revert(this.element);var d = this.currentDelta();if(revert && this.options.reverteffect) {if (dropped == 0 || revert != 'failure')
this.options.reverteffect(this.element,d[1]-this.delta[1], d[0]-this.delta[0]);} else {this.delta = d;}
if(this.options.zindex)
this.element.style.zIndex = this.originalZ;if(this.options.endeffect) 
this.options.endeffect(this.element);Draggables.deactivate(this);Droppables.reset();},keyPress: function(event) {if(event.keyCode!=Event.KEY_ESC) return;this.finishDrag(event, false);Event.stop(event);},endDrag: function(event) {if(!this.dragging) return;this.stopScrolling();this.finishDrag(event, true);Event.stop(event);},draw: function(point) {var pos = Position.cumulativeOffset(this.element);if(this.options.ghosting) {var r   = Position.realOffset(this.element);pos[0] += r[0] - Position.deltaX; pos[1] += r[1] - Position.deltaY;}
var d = this.currentDelta();pos[0] -= d[0]; pos[1] -= d[1];if(this.options.scroll && (this.options.scroll != window && this._isScrollChild)) {pos[0] -= this.options.scroll.scrollLeft-this.originalScrollLeft;pos[1] -= this.options.scroll.scrollTop-this.originalScrollTop;}
var p = [0,1].map(function(i){return (point[i]-pos[i]-this.offset[i]) 
}.bind(this));if(this.options.snap) {if(Object.isFunction(this.options.snap)) {p = this.options.snap(p[0],p[1],this);} else {if(Object.isArray(this.options.snap)) {p = p.map( function(v, i) {return (v/this.options.snap[i]).round()*this.options.snap[i] }.bind(this))
} else {p = p.map( function(v) {return (v/this.options.snap).round()*this.options.snap }.bind(this))
}
}}
var style = this.element.style;if((!this.options.constraint) || (this.options.constraint=='horizontal'))
style.left = p[0] + "px";if((!this.options.constraint) || (this.options.constraint=='vertical'))
style.top  = p[1] + "px";if(style.visibility=="hidden") style.visibility = "";},stopScrolling: function() {if(this.scrollInterval) {clearInterval(this.scrollInterval);this.scrollInterval = null;Draggables._lastScrollPointer = null;}
},startScrolling: function(speed) {if(!(speed[0] || speed[1])) return;this.scrollSpeed = [speed[0]*this.options.scrollSpeed,speed[1]*this.options.scrollSpeed];this.lastScrolled = new Date();this.scrollInterval = setInterval(this.scroll.bind(this), 10);},scroll: function() {var current = new Date();var delta = current - this.lastScrolled;this.lastScrolled = current;if(this.options.scroll == window) {with (this._getWindowScroll(this.options.scroll)) {if (this.scrollSpeed[0] || this.scrollSpeed[1]) {var d = delta / 1000;this.options.scroll.scrollTo( left + d*this.scrollSpeed[0], top + d*this.scrollSpeed[1] );}
}
} else {this.options.scroll.scrollLeft += this.scrollSpeed[0] * delta / 1000;this.options.scroll.scrollTop  += this.scrollSpeed[1] * delta / 1000;}
Position.prepare();Droppables.show(Draggables._lastPointer, this.element);Draggables.notify('onDrag', this);if (this._isScrollChild) {Draggables._lastScrollPointer = Draggables._lastScrollPointer || $A(Draggables._lastPointer);Draggables._lastScrollPointer[0] += this.scrollSpeed[0] * delta / 1000;Draggables._lastScrollPointer[1] += this.scrollSpeed[1] * delta / 1000;if (Draggables._lastScrollPointer[0] < 0)
Draggables._lastScrollPointer[0] = 0;if (Draggables._lastScrollPointer[1] < 0)
Draggables._lastScrollPointer[1] = 0;this.draw(Draggables._lastScrollPointer);}
if(this.options.change) this.options.change(this);},_getWindowScroll: function(w) {var T, L, W, H;with (w.document) {if (w.document.documentElement && documentElement.scrollTop) {T = documentElement.scrollTop;L = documentElement.scrollLeft;} else if (w.document.body) {T = body.scrollTop;L = body.scrollLeft;}
if (w.innerWidth) {W = w.innerWidth;H = w.innerHeight;} else if (w.document.documentElement && documentElement.clientWidth) {W = documentElement.clientWidth;H = documentElement.clientHeight;} else {W = body.offsetWidth;H = body.offsetHeight
}
}
return { top: T, left: L, width: W, height: H };}
});Draggable._dragging = { };var SortableObserver = Class.create({initialize: function(element, observer) {this.element   = $(element);this.observer  = observer;this.lastValue = Sortable.serialize(this.element);},onStart: function() {this.lastValue = Sortable.serialize(this.element);},onEnd: function() {Sortable.unmark();if(this.lastValue != Sortable.serialize(this.element))
this.observer(this.element)
}
});var Sortable = {SERIALIZE_RULE: /^[^_\-](?:[A-Za-z0-9\-\_]*)[_](.*)$/,sortables: { },_findRootElement: function(element) {while (element.tagName.toUpperCase() != "BODY") {if(element.id && Sortable.sortables[element.id]) return element;element = element.parentNode;}
},options: function(element) {element = Sortable._findRootElement($(element));if(!element) return;return Sortable.sortables[element.id];},destroy: function(element){var s = Sortable.options(element);if(s) {Draggables.removeObserver(s.element);s.droppables.each(function(d){ Droppables.remove(d) });s.draggables.invoke('destroy');delete Sortable.sortables[s.element.id];}
},create: function(element) {element = $(element);var options = Object.extend({element:     element,tag:         'li',dropOnEmpty: false,tree:        false,treeTag:     'ul',overlap:     'vertical',constraint:  'vertical',containment: element,handle:      false,only:        false,delay:       0,hoverclass:  null,ghosting:    false,quiet:       false,scroll:      false,scrollSensitivity: 20,scrollSpeed: 15,format:      this.SERIALIZE_RULE,elements:    false,handles:     false,onChange:    Prototype.emptyFunction,onUpdate:    Prototype.emptyFunction
}, arguments[1] || { });this.destroy(element);var options_for_draggable = {revert:      true,quiet:       options.quiet,scroll:      options.scroll,scrollSpeed: options.scrollSpeed,scrollSensitivity: options.scrollSensitivity,delay:       options.delay,ghosting:    options.ghosting,constraint:  options.constraint,handle:      options.handle };if(options.starteffect)
options_for_draggable.starteffect = options.starteffect;if(options.reverteffect)
options_for_draggable.reverteffect = options.reverteffect;else
if(options.ghosting) options_for_draggable.reverteffect = function(element) {element.style.top  = 0;element.style.left = 0;};if(options.endeffect)
options_for_draggable.endeffect = options.endeffect;if(options.zindex)
options_for_draggable.zindex = options.zindex;var options_for_droppable = {overlap:     options.overlap,containment: options.containment,tree:        options.tree,hoverclass:  options.hoverclass,onHover:     Sortable.onHover
}
var options_for_tree = {onHover:      Sortable.onEmptyHover,overlap:      options.overlap,containment:  options.containment,hoverclass:   options.hoverclass
}
Element.cleanWhitespace(element);options.draggables = [];options.droppables = [];if(options.dropOnEmpty || options.tree) {Droppables.add(element, options_for_tree);options.droppables.push(element);}
(options.elements || this.findElements(element, options) || []).each( function(e,i) {var handle = options.handles ? $(options.handles[i]) :
(options.handle ? $(e).select('.' + options.handle)[0] : e);options.draggables.push(
new Draggable(e, Object.extend(options_for_draggable, { handle: handle })));Droppables.add(e, options_for_droppable);if(options.tree) e.treeNode = element;options.droppables.push(e);});if(options.tree) {(Sortable.findTreeElements(element, options) || []).each( function(e) {Droppables.add(e, options_for_tree);e.treeNode = element;options.droppables.push(e);});}
this.sortables[element.id] = options;Draggables.addObserver(new SortableObserver(element, options.onUpdate));},findElements: function(element, options) {return Element.findChildren(
element, options.only, options.tree ? true : false, options.tag);},findTreeElements: function(element, options) {return Element.findChildren(
element, options.only, options.tree ? true : false, options.treeTag);},onHover: function(element, dropon, overlap) {if(Element.isParent(dropon, element)) return;if(overlap > .33 && overlap < .66 && Sortable.options(dropon).tree) {return;} else if(overlap>0.5) {Sortable.mark(dropon, 'before');if(dropon.previousSibling != element) {var oldParentNode = element.parentNode;element.style.visibility = "hidden";dropon.parentNode.insertBefore(element, dropon);if(dropon.parentNode!=oldParentNode) 
Sortable.options(oldParentNode).onChange(element);Sortable.options(dropon.parentNode).onChange(element);}
} else {Sortable.mark(dropon, 'after');var nextElement = dropon.nextSibling || null;if(nextElement != element) {var oldParentNode = element.parentNode;element.style.visibility = "hidden";dropon.parentNode.insertBefore(element, nextElement);if(dropon.parentNode!=oldParentNode) 
Sortable.options(oldParentNode).onChange(element);Sortable.options(dropon.parentNode).onChange(element);}
}
},onEmptyHover: function(element, dropon, overlap) {var oldParentNode = element.parentNode;var droponOptions = Sortable.options(dropon);if(!Element.isParent(dropon, element)) {var index;var children = Sortable.findElements(dropon, {tag: droponOptions.tag, only: droponOptions.only});var child = null;if(children) {var offset = Element.offsetSize(dropon, droponOptions.overlap) * (1.0 - overlap);for (index = 0; index < children.length; index += 1) {if (offset - Element.offsetSize (children[index], droponOptions.overlap) >= 0) {offset -= Element.offsetSize (children[index], droponOptions.overlap);} else if (offset - (Element.offsetSize (children[index], droponOptions.overlap) / 2) >= 0) {child = index + 1 < children.length ? children[index + 1] : null;break;} else {child = children[index];break;}
}
}
dropon.insertBefore(element, child);Sortable.options(oldParentNode).onChange(element);droponOptions.onChange(element);}
},unmark: function() {if(Sortable._marker) Sortable._marker.hide();},mark: function(dropon, position) {var sortable = Sortable.options(dropon.parentNode);if(sortable && !sortable.ghosting) return;if(!Sortable._marker) {Sortable._marker = 
($('dropmarker') || Element.extend(document.createElement('DIV'))).
hide().addClassName('dropmarker').setStyle({position:'absolute'});document.getElementsByTagName("body").item(0).appendChild(Sortable._marker);}    
var offsets = Position.cumulativeOffset(dropon);Sortable._marker.setStyle({left: offsets[0]+'px', top: offsets[1] + 'px'});if(position=='after')
if(sortable.overlap == 'horizontal') 
Sortable._marker.setStyle({left: (offsets[0]+dropon.clientWidth) + 'px'});else
Sortable._marker.setStyle({top: (offsets[1]+dropon.clientHeight) + 'px'});Sortable._marker.show();},_tree: function(element, options, parent) {var children = Sortable.findElements(element, options) || [];for (var i = 0; i < children.length; ++i) {var match = children[i].id.match(options.format);if (!match) continue;var child = {id: encodeURIComponent(match ? match[1] : null),element: element,parent: parent,children: [],position: parent.children.length,container: $(children[i]).down(options.treeTag)
}
if (child.container)
this._tree(child.container, options, child)
parent.children.push (child);}
return parent;},tree: function(element) {element = $(element);var sortableOptions = this.options(element);var options = Object.extend({tag: sortableOptions.tag,treeTag: sortableOptions.treeTag,only: sortableOptions.only,name: element.id,format: sortableOptions.format
}, arguments[1] || { });var root = {id: null,parent: null,children: [],container: element,position: 0
}
return Sortable._tree(element, options, root);},_constructIndex: function(node) {var index = '';do {if (node.id) index = '[' + node.position + ']' + index;} while ((node = node.parent) != null);return index;},sequence: function(element) {element = $(element);var options = Object.extend(this.options(element), arguments[1] || { });return $(this.findElements(element, options) || []).map( function(item) {return item.id.match(options.format) ? item.id.match(options.format)[1] : '';});},setSequence: function(element, new_sequence) {element = $(element);var options = Object.extend(this.options(element), arguments[2] || { });var nodeMap = { };this.findElements(element, options).each( function(n) {if (n.id.match(options.format))
nodeMap[n.id.match(options.format)[1]] = [n, n.parentNode];n.parentNode.removeChild(n);});new_sequence.each(function(ident) {var n = nodeMap[ident];if (n) {n[1].appendChild(n[0]);delete nodeMap[ident];}
});},serialize: function(element) {element = $(element);var options = Object.extend(Sortable.options(element), arguments[1] || { });var name = encodeURIComponent(
(arguments[1] && arguments[1].name) ? arguments[1].name : element.id);if (options.tree) {return Sortable.tree(element, arguments[1]).children.map( function (item) {return [name + Sortable._constructIndex(item) + "[id]=" + 
encodeURIComponent(item.id)].concat(item.children.map(arguments.callee));}).flatten().join('&');} else {return Sortable.sequence(element, arguments[1]).map( function(item) {return name + "[]=" + encodeURIComponent(item);}).join('&');}
}
}
Element.isParent = function(child, element) {if (!child.parentNode || child == element) return false;if (child.parentNode == element) return true;return Element.isParent(child.parentNode, element);}
Element.findChildren = function(element, only, recursive, tagName) {if(!element.hasChildNodes()) return null;tagName = tagName.toUpperCase();if(only) only = [only].flatten();var elements = [];$A(element.childNodes).each( function(e) {if(e.tagName && e.tagName.toUpperCase()==tagName &&
(!only || (Element.classNames(e).detect(function(v) { return only.include(v) }))))
elements.push(e);if(recursive) {var grandchildren = Element.findChildren(e, only, recursive, tagName);if(grandchildren) elements.push(grandchildren);}
});return (elements.length>0 ? elements.flatten() : []);}
Element.offsetSize = function (element, type) {return element['offset' + ((type=='vertical' || type=='height') ? 'Height' : 'Width')];}