var scrolling = 0;
	var dninterval;
	var upinterval;
	
	if (document.images)
   	{
    	righton= new Image();
     	righton.src="Images/arrow_right_over.gif";  

		rightoff= new Image();
		rightoff.src="Images/arrow_right.gif";
		
		lefton= new Image();
     	lefton.src="Images/arrow_left_over.gif";  

		leftoff= new Image();
		leftoff.src="Images/arrow_left.gif";
		
    }

	function lightup(imgName)
	 {
	   if (document.images)
		{
		  imgOn=eval(imgName + "on.src");
		  document.images[imgName].src= imgOn;
		}
	 }
	
	function turnoff(imgName)
	 {
	   if (document.images)
		{
		  imgOff=eval(imgName + "off.src");
		  document.images[imgName].src= imgOff;
		}
	 }

	function displayFullSize(filePath) 
	{
		if (document.images)
		{
			document.images['imageHolder'].src = filePath;
		}
	}

	function scrollDownLine()
	{
		 document.getElementById("scrollDiv").scrollLeft += 1;
	}
	
	function scrollUpLine()
	{
		document.getElementById("scrollDiv").scrollLeft -= 1;
	}
	
	function startScrollDown () {
		dninterval = setInterval("scrollDownLine()", 15);
		//document.images["downarrow"].src = "Images/arrows_dn_over.gif";
		lightup('right');
	}
	
	function stopScrollingDown () {
		clearInterval(dninterval);
		//document.images["downarrow"].src = "Images/arrows_dn.gif";
		turnoff('right');
	}
	
	function startScrollUp () {
		upinterval = setInterval("scrollUpLine()", 15);
		//document.images["uparrow"].src = "Images/arrows_up_over.gif";
		lightup('left');
	}
	
	function stopScrollingUp () {
		clearInterval(upinterval);
		//document.images["uparrow"].src = "Images/arrows_up.gif";
		turnoff('left');
	}