$(document).ready(
	function(){
		$("div.main div.left div.menu a.button").mouseover(
			function(){
				var cFileName = $(this).find("img").attr("src");
				var splittedCFileName = cFileName.split(".");
				var newFileName = splittedCFileName[0]+"_over."+splittedCFileName[1];
				$(this).find("img").attr("src",newFileName);
			}
		);
		$("div.main div.left div.menu a.button").mouseout(
			function(){
				$(this).find("img").attr("src",$(this).find("img").attr("src").replace("_over",""));
			}
		);
	}
);