var non_selected_bg = "url(../Images/Lopelope_NonSelectedMenuItem.jpg) no-repeat center center";
var selected_bg = "url(../Images/Lopelope_SelectedMenuItem.jpg) no-repeat center center";

function mover(aa) {
    aa.style.background = selected_bg;
}
function mout(aa) {
    aa.style.background = non_selected_bg;
}