function MouseOverMenu(menuitem) 
{

    var picturename = menuitem.replace('ctl00_', '');
    document.getElementById(menuitem).src = "/media/" + picturename + "_over.png";
}

function MouseOutMenu(menuitem) {
    var picturename = menuitem.replace('ctl00_', '');
    document.getElementById(menuitem).src = "/media/" + picturename + ".png";
}