// JavaScript Document

/*******************************************************************
* Pausing up-down scroller- © Dynamic Drive (www.dynamicdrive.com)
* This notice MUST stay intact for legal use
* Visit http://www.dynamicdrive.com/ for this script and 100s more.
********************************************************************/


// -------------------------------------------------------------
// pausescroller(content, divId, divClass, delay)- main function
//
// Inputs:
// content = name of array variable that contains the HTML
//           content to rotate           
// divId = name of the HTML ID tag attached to the ticker DIV
// divClass = name of the CSS class attached to the ticker DIV
// delay = delay between message changes (in miliseconds)
//
// Outputs:
// A ticker DIV that rotates the messages specified by the
// content array.
//
// -------------------------------------------------------------
function pausescroller(content, divId, divClass, delay) {
	this.content=content; // Mame of message array
	this.tickerid=divId; // ID of ticker div
	this.delay=delay; // Delay between message changes, 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
	document.write('<div id="'+divId+'" class="'+divClass+'" style="position: relative; overflow: hidden"><div class="innerDiv" style="position: absolute; width: 100%" id="'+divId+'1">'+content[0]+'</div><div class="innerDiv" style="position: absolute; width: 100%; visibility: hidden" id="'+divId+'2">'+content[1]+'</div></div>');
	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
// -----------------------------------------------------------------
pausescroller.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(pausescroller.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
// --------------------------------------------------------------------
pausescroller.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
// --------------------------------------------------------------------------
pausescroller.prototype.swapdivs=function()
{
	var tempcontainer=this.visiblediv;
	this.visiblediv=this.hiddendiv;
	this.hiddendiv=tempcontainer;
}

pausescroller.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
// --------------------------------------------------------------------------------
pausescroller.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();
	}
}

pausescroller.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;
	}
}