// jQuery rollover

jQuery.fn.rollover = function(settings){
	settings = jQuery.extend({
	suffix: "_over"
	}, settings);
	return this.each(function(){
	var default_img = $(this).attr("src");
		if (!default_img.match((settings.suffix))) {
		var point = default_img.lastIndexOf(".");
		var mouseover_img = default_img.slice(0, point) + settings.suffix + default_img.slice(point);
		var preload_img = new Image();
		preload_img.src = mouseover_img;
		$(this).hover(
			function(){
			$(this).attr("src", mouseover_img);
			},
				function(){
				$(this).attr("src", default_img);
				}
				);
		};
	});
};