//Animated Collapsible DIV- Author: Dynamic Drive (http://www.dynamicdrive.com)
//Last updated Aug 1st, 07'. Fixed bug with "block" parameter not working when persist is enabled
//Updated June 27th, 07'. Added ability for a DIV to be initially expanded.

var uniquepageid=window.location.href.replace("http://"+window.location.hostname, "").replace(/^\//, "") //get current page path and name, used to uniquely identify this page for persistence feature

function animatedcollapse(divId, animatetime, persistexpand, initstate, cotraido){
this.divId=divId
	
	this.divId=divId
	this.divObj=document.getElementById(divId)
	this.divObj.style.overflow="hidden"
	this.timelength=animatetime
	this.initstate=(typeof initstate!="undefined" && initstate=="block")? "block" : "contract"
	this.isExpanded=animatedcollapse.getCookie(uniquepageid+"-"+divId) //"yes" or "no", based on cookie value
	this.contentheight=parseInt(this.divObj.style.height)
//	this.contentheight=''
	var thisobj=this
	
	if(cotraido==null){
		
	}else{
		// this.isExpanded="yes"

		//cotraido=null
	}
if (isNaN(this.contentheight)){ //if no CSS "height" attribute explicitly defined, get DIV's height on window.load
	animatedcollapse.dotask(window, function(){thisobj._getheight(persistexpand)}, "load")
	
//if (!persistexpand && this.initstate=="contract" || persistexpand && this.isExpanded!="yes" && this.isExpanded!="") //Hide DIV (unless div should be expanded by default, OR persistence is enabled and this DIV should be expanded)
if ( this.initstate=="contract" ) 

	this.divObj.style.visibility="hidden" //hide content (versus collapse) until we can get its height
}
else if (!persistexpand && this.initstate=="contract" || persistexpand && this.isExpanded!="yes" && this.isExpanded!="") //Hide DIV (unless div should be expanded by default, OR persistence is enabled and this DIV should be expanded)
this.divObj.style.height=0 //just collapse content if CSS "height" attribute available
if (persistexpand)
	animatedcollapse.dotask(window, function(){animatedcollapse.setCookie(uniquepageid+"-"+thisobj.divId, thisobj.isExpanded)}, "unload")
}

animatedcollapse.prototype._getheight=function(persistexpand){
	this.contentheight=this.divObj.offsetHeight
if (!persistexpand && this.initstate=="contract" || persistexpand && this.isExpanded!="yes"){ //Hide DIV (unless div should be expanded by default, OR persistence is enabled and this DIV should be expanded)
	this.divObj.style.height=0 //collapse content
	this.divObj.style.visibility="visible"
}
else //else if persistence is enabled AND this content should be expanded, define its CSS height value so slideup() has something to work with
	this.divObj.style.height=this.contentheight+"px"
}


animatedcollapse.prototype._slideengine=function(direction){
	var elapsed=new Date().getTime()-this.startTime //get time animation has run
	var thisobj=this
		if (elapsed<this.timelength){ //if time run is less than specified length
			var distancepercent=(direction=="down")? animatedcollapse.curveincrement(elapsed/this.timelength) : 1-animatedcollapse.curveincrement(elapsed/this.timelength)
			this.divObj.style.height=distancepercent * this.contentheight +"px"
			this.runtimer=setTimeout(function(){thisobj._slideengine(direction)}, 10)
		}
		else{ //if animation finished
			this.divObj.style.height=(direction=="down")? this.contentheight+"px" : 0
			this.isExpanded=(direction=="down")? "yes" : "no" //remember whether content is expanded or not
			this.runtimer=null
		}
}


animatedcollapse.prototype.slidedown=function(){
if (typeof this.runtimer=="undefined" || this.runtimer==null){ //if animation isn't already running or has stopped running
	if (isNaN(this.contentheight)) //if content height not available yet (until window.onload)
	alert("[slidedown] Por favor, espere hasta que el documento se ha cargado a continuación, haga clic de nuevo")
		else if (parseInt(this.divObj.style.height)==0){ //if content is collapsed
			this.startTime=new Date().getTime() //Set animation start time
			this._slideengine("down")
		}
	}
}

animatedcollapse.prototype.slideup=function(){
if (typeof this.runtimer=="undefined" || this.runtimer==null){ //if animation isn't already running or has stopped running
	if (isNaN(this.contentheight)) //if content height not available yet (until window.onload)
	alert("[slideup] Por favor, espere hasta que el documento se ha cargado a continuación, haga clic de nuevo")
		else if (parseInt(this.divObj.style.height)==this.contentheight){ //if content is expanded
			this.startTime=new Date().getTime()
			this._slideengine("up")
		}
	}
}

animatedcollapse.prototype.slideit=function(){
if (isNaN(this.contentheight)) //if content height not available yet (until window.onload)
alert("[slideit] Por favor, espere hasta que el documento se ha cargado a continuación, haga clic de nuevo")
	else if (parseInt(this.divObj.style.height)==0)
		this.slidedown()
	else if (parseInt(this.divObj.style.height)==this.contentheight)
		this.slideup()
}

// -------------------------------------------------------------------
// A few utility functions below:
// -------------------------------------------------------------------

animatedcollapse.curveincrement=function(percent){
	return (1-Math.cos(percent*Math.PI)) / 2 //return cos curve based value from a percentage input
}


animatedcollapse.dotask=function(target, functionref, tasktype){ //assign a function to execute to an event handler (ie: onunload)
var tasktype=(window.addEventListener)? tasktype : "on"+tasktype
if (target.addEventListener)
	target.addEventListener(tasktype, functionref, false)
	else if (target.attachEvent)
	target.attachEvent(tasktype, functionref)
}

animatedcollapse.getCookie=function(Name){ 
var re=new RegExp(Name+"=[^;]+", "i"); //construct RE to search for target name/value pair
if (document.cookie.match(re)) //if cookie found
	return document.cookie.match(re)[0].split("=")[1] //return its value
	return ""
}

animatedcollapse.setCookie=function(name, value){
	document.cookie = name+"="+value
}