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

// instantiation:
//  new pausescroller(name_of_message_array, CSS_ID, CSS_classname, pause_in_miliseconds)
//  message_array is array of content (incl html formatting, if desired) to display, one per array element

// required css class:
// 	.innerScrollDiv {
//		position: absolute;
//		width: 100%;
//		}
//	.outerScrollDiv {		// applies to container
//		overflow: hidden;
//		}

// modifications:
// RCE 2009-02-08
//	dropped document.write for creation in favor of insertion into existing div, "divId"
//	removed automatic setting of width
//	added fifth creation parameter, fmt_fn, which if present receives the content for a given
//		div and returns it formatted
//

function pausescroller(content, divId, divClass, delay, fmt_fn){
	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)
	
	if (fmt_fn) {
		this.fmt_fn = fmt_fn;		// function to format element
	} else {
		this.fmt_fn = def_scroll_fmt_fn;	// use default
	}
/*	
	document.write('<div id="'+divId+'" class="'+divClass+' outerScrollDiv">'+
					   	'<div class="innerScrollDiv" id="'+divId+'1">'+
					   		content[0]+
						'</div>'+
					   	'<div class="innerScrollDiv" style="visibility: hidden" id="'+divId+'2">'+
					   		content[1]+
						'</div>'+
					'</div>')
*/	
	var sub1 = Math.round(Math.random() * (content.length-1));
	var sub2 = (sub1+1 == content.length ? 0 : sub1+1);
	document.getElementById(divId).innerHTML = '<div class="'+divClass+'" id="'+divId+'1">'+this.fmt_fn(content[sub1])+'</div>'+
												'<div class="'+divClass+'" style="visibility: hidden" id="'+divId+'2">'+this.fmt_fn(content[sub2])+'</div>';
	this.hiddendivpointer = sub2;

	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=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)
	// RCE 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"
}

function def_scroll_fmt_fn(content){return(content);}

// -------------------------------------------------------------------
// 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.fmt_fn(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
	}
}