function ShowSubmenu(myMenu) {

    var menuStyle = document.getElementById(myMenu).style;
    if (menuStyle.display == "none") {
        menuStyle.display = "block";
    }
    else
        menuStyle.display = "none";
}

function ShowDiv(myDiv) {
    myDiv = "ctl00_Main_Menu" + myDiv;
    var divStyle = document.getElementById(myDiv).style;
    
    for (var i = 1; i <= 5; i++) {
        var otherDiv = "ctl00_Main_MenuTable" + i;
        otherDivStyle = document.getElementById(otherDiv).style;
        otherDivStyle.display = "none";
    }
    divStyle.display = "block";
}