function newImage(arg) {
if (document.images) {
rslt = new Image();
rslt.src = arg;
return rslt;
}
}

function changeImages() {
if (document.images && (preloadFlag == true)) {
for (var i=0; i<changeImages.arguments.length; i+=2) {
document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
}
}
}

var preloadFlag = false;
function preloadImages() {
if (document.images) {
menu_01_over = newImage("assets/templates/default/images/menu_uslugi_over.png");
menu_02_over = newImage("assets/templates/default/images/menu_zakaz_over.png");
menu_03_over = newImage("assets/templates/default/images/menu_marshruti_over.png");
preloadFlag = true;
}
}