function over(arg)
{
	if(document.images && document.images[arg].highlight)
	{
		document.images[arg].src = document.images[arg].highlight.src;
	}
}
	
function out(arg)
{
	if(document.images && document.images[arg].initial)
	{
		document.images[arg].src = document.images[arg].initial.src;
	}
}
	
function preLoad()
{  
	if(document.images)
	{
		var suffices = new Array();

		//	Supported rollover image types
		suffices[0] = '0.gif';
		suffices[1] = '0.jpg';
		suffices[2] = '0.png';
		
		for(i = 0; i < document.images.length; i++)
		{
			//	Set suffix start point and the suffix
			var suffixStart = -1;
			var suffix;

			for(j = 0; j < suffices.length && suffixStart < 0; j++)
			{
				suffixStart = document.images[i].src.lastIndexOf(suffices[j]);
				suffix = document.images[i].src.substring(suffixStart+1, suffixStart+5);
			}

			if(suffixStart >= 0)
			{
				// It's a rollover
				var initial = new Image();

				// Record initial image
				initial.src = document.images[i].src;

				document.images[i].initial = initial;

				// Load & record highlight image
				var highlight = new Image();

				highlight.src = document.images[i].src.substring(0, suffixStart) + '1' + suffix;

				document.images[i].highlight = highlight;
			}
		}
	}
}