function mainover(div_id) {
    var elemt = document.getElementById(div_id);
    if (elemt.style.display != "block") {
        elemt.style.display = "block";
    }
    else {
        elemt.style.display = "none";
    }
    disableOthers(elemt,div_id);
}
function disableOthers(elemt,div_id) {
    var subMenuDivArray = elemt.parentNode.getElementsByTagName("div");
    for (var i=0;i<subMenuDivArray.length;i++) {
        var divElemt = subMenuDivArray[i];
        if (divElemt.id != '') {
            if (divElemt.id != div_id) {
                divElemt.style.display = "none";
            }
        }
    }
}