function highlight_menu(id) {
    document.getElementById(id).style.backgroundImage = "url(images/icon_"+id+".png)";
    document.getElementById(id).style.backgroundPosition = "0 -128px";

}
function highlight_menu2(id) {
    document.getElementById(id).style.backgroundImage = "url(images/icon_"+id+".png)";
    document.getElementById(id).style.backgroundPosition = "0 0";
}

function highlight_submenu(id) {
    document.getElementById(id).style.backgroundImage = "url(images/title_sb_middle.png)";
    document.getElementById(id).style.backgroundPosition = "0 0";
}

function highlight_submenu2(id) {
    document.getElementById(id).style.backgroundImage = "";
    document.getElementById(id).style.backgroundPosition = "0 0";
}