$(document).ready(function(){

	// preload images
    preload([
		'/img_design/menu-item-bg-act.gif',
		'/img_design/button_over.gif'
		]);

function preload(images) {
    if (typeof document.body == "undefined") return;
    try {

        var div = document.createElement("div");
        var s = div.style;
		    s.position = "absolute";
        s.top = s.left = 0;
        s.visibility = "hidden";
        document.body.appendChild(div);
		div.innerHTML = "<img src=\"" + images.join("\" /><img src=\"") + "\" />";
		var lastImg = div.lastChild;
		lastImg.onload = function() { document.body.removeChild(document.body.lastChild); };
	 }
	 catch(e) {
        // Error. Do nothing.
	}
}

});