//Image swapping script
var prImages = [];
var mainsource = "";
var bgsource = "";
	
function swapImageBack(name)
{
	document.images[name].src = mainsource;
	return true;		
}

function swapImage(name)
{
	mainsource = document.images[name].src;
	var strlength = document.images[name].src.length;
	var srcpath = document.images[name].src.substring(0,strlength-4);
	var ext = document.images[name].src.substring(strlength-4,strlength);
	document.images[name].src = srcpath.concat("_roll",ext);
	return true;
}

function preloadImages(imgarray)
{
	var image = new Image();
	for(i = 0; i < imgarray.length; i++)
	{
		image.src = imgarray[i];
	}		
}

function setVisibility(id, value)
{
	var obj = document.getElementById(id);
	obj.style.visibility = value;	
}