jQuery.preloadImages = function()
{
	for(var i = 0; i<arguments.length; i++)
	{
		jQuery("<img>").attr("src", arguments[i]);
	}
}

// preload images first (can run before page is fully loaded)
$.preloadImages("images/driving_instructor_products_rollover.png");
$(
	function()
	{
		// set up rollover
		$("img.rollover").hover(
			function()
			{
				this.src = this.src.replace("_normal","_rollover");
			},
			function()
			{
				this.src = this.src.replace("_rollover","_normal");
			}
		);
	}
)