function RollIn(img)
	{
		if (document.images)
		{
			var imgOn = img.src;
			//remove the .gif from the source
			imgOn = imgOn.substr(0,imgOn.length - 4);
			//concat _On.gif back on
			imgOn = imgOn + "_On.gif";
			img.src = imgOn;
		}
	}
	
	function RollOut(img)
	{
		if (document.images)
		{
			var imgOut = img.src;
			//remove the .gif from the source
			imgOut = imgOut.substr(0,imgOut.length - 7);
			//concat .gif back on
			imgOut = imgOut + ".gif";
			img.src = imgOut;
		}
	}