/***********************************************
* 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.
***********************************************/

function pausescroller(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 sl = '<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>';
	document.getElementById("promo-graphics-top-alt").innerHTML = sl;
	//document.write()
	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;
	}
}