/***********************************************
* 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 GN_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
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
// -------------------------------------------------------------------

GN_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(GN_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
// -------------------------------------------------------------------

GN_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
// -------------------------------------------------------------------

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

GN_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
// -------------------------------------------------------------------

GN_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();
}
}

GN_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;
}