$(document).ready(function(){
	// rollovers
	// preload rollover images
	$('.rollover').children('img').each(function() {
		rollsrc = $(this).attr('src');
		rollON = rollsrc.replace(/(.*)\.(jpg|gif|png)$/i, '$1_over.$2');
		$('<img>').attr('src', rollON);
	});

	// check for rollover
	$('.rollover').mouseover(function(){
		imgsrc=$(this).children('img').attr('src');
		matches = imgsrc.match(/_over/);

		// don't do the rollover if state is already ON
		if (!matches) {
			imgsrcOn = imgsrc.replace(/(.*)\.(jpg|gif|png)$/i, '$1_over.$2');
			$(this).children('img').attr('src', imgsrcOn);
		}

		$('.rollover').mouseout(function(){
			$(this).children('img').attr('src', imgsrc);
		});
	});
	
});