// JavaScript Document

function txtscroller(content, divId, divClass, delay)
{
	this.content=content //message array content
	this.tickerid=divId //ID of ticker div to display information
	this.delay=delay //Delay between msg change, in miliseconds.
	this.mouseoverBol=0 //Boolean to indicate whether mouse is currently over scroller (and pause it if it is)
	this.hiddendivpointer=1 //index of message array for hidden div
	
	var wrtstr='<div id="'+divId+'" class="'+divClass+'" style="position: relative; overflow: hidden">'
	wrtstr=wrtstr+'<div class="innerDiv" style="position: absolute; text-align:center; width: 100%" id="'+divId+'1">'+content[0]
	wrtstr=wrtstr+'</div><div class="innerDiv" style="position: absolute; width: 100%; text-align:center; visibility: hidden" id="'+divId+'2">'+content[1]+'</div></div>'
	
	document.write(wrtstr)
	var scrollerinstance=this
	if (window.addEventListener) //run onload in DOM2 browsers
		window.addEventListener("load", function(){scrollerinstance.initialize()}, false)
	else if (window.attachEvent) //run onload in IE5.5+
		window.attachEvent("onload", function(){scrollerinstance.initialize()})
	else if (document.getElementById) //if legacy DOM browsers, just start scroller after 0.5 sec
		setTimeout(function(){scrollerinstance.initialize()}, 500)
}

// -------------------------------------------------------------------
// initialize()- Initialize scroller method.
// -Get div objects, set initial positions, start up down animation
// -------------------------------------------------------------------

txtscroller.prototype.initialize=function()
{
	this.tickerdiv=document.getElementById(this.tickerid)
	this.visiblediv=document.getElementById(this.tickerid+"1")
	this.hiddendiv=document.getElementById(this.tickerid+"2")
	this.visibledivtop=parseInt(txtscroller.getCSSpadding(this.tickerdiv))

	//set width of inner DIVs to outer DIV's width minus padding (padding assumed to be top padding x 2)
	this.visiblediv.style.width=this.hiddendiv.style.width=this.tickerdiv.offsetWidth-(this.visibledivtop*2)+"px"
	this.getinline(this.visiblediv, this.hiddendiv)
	this.hiddendiv.style.visibility="visible"
	var scrollerinstance=this
	document.getElementById(this.tickerid).onmouseover=function(){scrollerinstance.mouseoverBol=1}
	document.getElementById(this.tickerid).onmouseout=function(){scrollerinstance.mouseoverBol=0}
	if (window.attachEvent) //Clean up loose references in IE
		window.attachEvent("onunload", function(){scrollerinstance.tickerdiv.onmouseover=scrollerinstance.tickerdiv.onmouseout=null})
		setTimeout(function(){scrollerinstance.animateup()}, this.delay)
}


// -------------------------------------------------------------------
// animateup()- Move the two inner divs of the scroller up and in sync
// -------------------------------------------------------------------

txtscroller.prototype.animateup=function()
{
	var scrollerinstance=this
	if (parseInt(this.hiddendiv.style.top)>(this.visibledivtop+5))
	{
	this.visiblediv.style.top=parseInt(this.visiblediv.style.top)-5+"px"
	this.hiddendiv.style.top=parseInt(this.hiddendiv.style.top)-5+"px"
	setTimeout(function(){scrollerinstance.animateup()}, 50)
	}
	else
	{
	this.getinline(this.hiddendiv, this.visiblediv)
	this.swapdivs()
	setTimeout(function(){scrollerinstance.setmessage()}, this.delay)
	}
}

// -------------------------------------------------------------------
// swapdivs()- Swap between which is the visible and which is the hidden div
// -------------------------------------------------------------------

txtscroller.prototype.swapdivs=function()
{
	var tempcontainer=this.visiblediv
	this.visiblediv=this.hiddendiv
	this.hiddendiv=tempcontainer
}

	txtscroller.prototype.getinline=function(div1, div2)
	{
	div1.style.top=this.visibledivtop+"px"
	div2.style.top=Math.max(div1.parentNode.offsetHeight, div1.offsetHeight)+"px"
	}

// -------------------------------------------------------------------
// setmessage()- Populate the hidden div with the next message before it's visible
// -------------------------------------------------------------------

txtscroller.prototype.setmessage=function()
{
	var scrollerinstance=this
	if (this.mouseoverBol==1) //if mouse is currently over scoller, do nothing (pause it)
		setTimeout(function(){scrollerinstance.setmessage()}, 100)
	else
	{
		var i=this.hiddendivpointer
		var ceiling=this.content.length
		this.hiddendivpointer=(i+1>ceiling-1)? 0 : i+1
		this.hiddendiv.innerHTML=this.content[this.hiddendivpointer]
		this.animateup()
	}
}

txtscroller.getCSSpadding=function(tickerobj)
{ //get CSS padding value, if any
	if (tickerobj.currentStyle)
		return tickerobj.currentStyle["paddingTop"]
	else if (window.getComputedStyle) //if DOM2
		return window.getComputedStyle(tickerobj, "").getPropertyValue("padding-top")
	else
		return 0
}

function modcss(theClass,element,value)
{
	 var style_rule;
	 if (document.all)
	 {
		 style_rule = 'rules';
	 }
	 else if (document.getElementById)
	 {
		 style_rule = 'cssRules';
	 }
	 var added = false;
	 for (var styl = 0; styl < document.styleSheets.length; styl++)
	 {
		 for (var rle = 0; rle < document.styleSheets[rle][style_rule].length; rle++)
		 {
			 if (document.styleSheets[styl][style_rule][rle].selectorText == theClass)
			 {
				 if(document.styleSheets[styl][style_rule][rle].style[element])
				 {
					 document.styleSheets[styl][style_rule][rle].style[element] = value;
					 added=true;
					 break;
				}
			}
		}
		if(!added)
		{
			if(document.styleSheets[styl].insertRule)
			{
				document.styleSheets[styl].insertRule(theClass+' { '+element+': '+value+'; }',document.styleSheets[styl][style_rule].length);
			}
			else if (document.styleSheets[styl].addRule)
			{
				document.styleSheets[styl].addRule(theClass,element+': '+value+';');
			}
		}
	}
}