$(document).ready(function() {
    	$('.menu').hover(function() {
    		var img = $(this).children();
    		var val = img.attr('src');
    		var newval = val.substring(val.lastIndexOf("/")+1);
    		newval = newval.substring(0,newval.length-4);
    		img.attr('src','images/' + newval + '_over.png');
    	}, function() {
    		var img = $(this).children();
    		var val = img.attr('src');
    		var newval = val.substring(val.lastIndexOf("/")+1);
    		newval = newval.substring(0,newval.length-9);
    		img.attr('src','images/' + newval + '.png');
    	});
    })