var images = [
	{ "src" : "/template/common/images/menu/case.jpg" },
	{ "src" : "/template/common/images/menu/case_hover.jpg" },
	{ "src" : "/template/common/images/menu/contact.jpg" },
	{ "src" : "/template/common/images/menu/contact_hover.jpg" },
	{ "src" : "/template/common/images/menu/portfolio.jpg" },
	{ "src" : "/template/common/images/menu/portfolio_hover.jpg" },
	{ "src" : "/template/common/images/menu/whatwedo.jpg" },
	{ "src" : "/template/common/images/menu/whatwedo_hover.jpg" }
];

$(document).ready(function(){
    $(images).each( function(i) {
	    $(new Image()).attr('src', images[i].src);
	}); 
});