// scrolling.js

// the following items can be changed to alter the speeds and so on of the scrolling routines
var autoscrollspeed=1;  // the number of pixels that the autoscroll moves by
var autoscrollrate=20;  // the number of milliseconds between moves (1000 milliseconds=1 second)
var autotimer;

// contains all the scrolling routines for the template system
var thisisthefirst=true;
var whichLayerIsTop=new Array();

	
function findHeight(objectID) {
	f=document.getElementById(objectID);
	
	if(f.offsetHeight)
		return f.offsetHeight;
	return 0;
}

function findWidth(objectID) {
	f=document.getElementById(objectID);
	
	if(f.offsetHeight)
		return f.offsetHeight;
	return 0;
}

function findTop(objectID) {
	var domStyle = document.getElementById(objectID).style;
	var dom = document.getElementById(objectID);
	if (domStyle.top)
		return domStyle.top;
	if (domStyle.pixelTop)
		return domStyle.pixelTop;
	if (dom.offsetTop)
		return dom.offsetTop;
	return (0);
}

function autoScroll(){
	clearTimeout(autotimer);
	// cycle throught the autoscroll divs
	// for each one, get the current position and the height
	// also get the height of it's container
	// move it, and then setTimeout!
	if(autoscrollerlayers.length==0) // there isn't anything to scroll
		return;  // and don't set a timeout!
		
	if(thisisthefirst){
		// set the top one to be 0
		for(c=0;c<autoscrollerlayers.length;c++)
			whichLayerIsTop[c]=0;
			
		thisisthefirst=false;
	}
	
	for(c=0;c<autoscrollerlayers.length;c++){
		name=autoscrollerlayers[c];
		
		topMod="";
		if(whichLayerIsTop[c]==1)
			topMod="2";
		
		
		iH=findHeight(name+"Div"+topMod);
		iT=findTop(name+"Div"+topMod);
		oH=findHeight(name+"Container");
		iH=parseInt(iH);
		iT=parseInt(iT);
		oH=parseInt(oH);
				
		if(iH>oH) // we need to scroll
		{
			if(iT+iH>0) // still showing
				iT-=autoscrollspeed;
			else{
				// we need to loop it round!
				// so make the top the height
				
				//iT=oH; // start at the bottom again!
				iT=iH;
				whichLayerIsTop[c]= whichLayerIsTop[c]==0 ? 1 : 0; // change the layer over.
			}

		f=document.getElementById(name+"Div"+topMod).style;
		f.top=iT;
		
		// now move the other layer up.
		topMod = topMod=="" ? "2" : "";
		iT=findTop(name+"Div"+topMod);
		iT=parseInt(iT);
		iT-=autoscrollspeed;
		f=document.getElementById(name+"Div"+topMod).style;
		f.top=iT;
		}
	}

	autotimer=setTimeout("autoScroll()",autoscrollrate);

}



















var hidetimer=null;
var scrolltimer=null;
var stoptimer=null;
var scrollAmount=3,scrollMax=8,scrollDir=-1;


function scrollIt(d,n){
	// rollover effect...
	modifier=d==-1 ? "up" : "down";
	
	eval("document.images."+n+modifier+"arrowIMG.src=arrow"+modifier+"ov.src");
	
	// get textTop...
	textTop=findTop(n+"Div");
	textTop=parseInt(textTop);
	
	var oh=document.getElementById(n+"Container").offsetHeight;

	
	clearTimeout(stoptimer);
	if(d!=scrollDir && scrollDir>=0)scrollAmount=-scrollAmount;
	scrollDir=d;
	f=document.getElementById(n+"Div");
	
	h=f.offsetHeight;
	if(h<oh)return;

	
	textTop=scrollDir==1 ? textTop-scrollAmount : textTop+scrollAmount;
	if((textTop+h)<oh && h>oh)textTop=oh-h;
	if(textTop>0)textTop=0;
	f.style.top=textTop;
	scrollAmount++;

	if(scrollAmount>scrollMax)scrollAmount=scrollMax;
	ll="scrolltimer=setTimeout(\"scrollIt("+d+",'"+n+"')\",60)";

	eval(ll);
}

function stopScroll(n){
	modifier="up";

	eval("document.images."+n+modifier+"arrowIMG.src=arrow"+modifier+".src");

	modifier="down";

	eval("document.images."+n+modifier+"arrowIMG.src=arrow"+modifier+".src");


	textTop=findTop(n+"Div");
	textTop=parseInt(textTop);
		
	var oh=document.getElementById(n+"Container").offsetHeight;

	clearTimeout(scrolltimer);
	f=document.getElementById(n+"Div");
	h=f.offsetHeight;	
	if(h<oh)
		return;		
	if(scrollAmount!=0)scrollAmount=scrollAmount>0 ? scrollAmount-1 : scrollAmount+1;
	if(scrollAmount!=0)
	{
		
		textTop=scrollDir>0 ? textTop-scrollAmount : textTop+scrollAmount;
		if((textTop+h)<oh && h>oh)textTop=oh-h;
		if(textTop>0)textTop=0;
		f.style.top=textTop;
		ll="stoptimer=setTimeout(\"stopScroll('"+n+"')\",60)";
		eval(ll);
	}
	else
		scrollDir=-1;
}