function doMenu(mode, id) {
    var objDiv = getObj('div_menu'+id);
    if (mode == 1) {
        objDiv.style.visibility = 'visible';
    } else {
        objDiv.style.visibility = 'hidden';
    }
}

function getObj(objName) {
    if(document.getElementById && document.getElementById(objName)) {
        return document.getElementById(objName);
    }
    else if (document.all && document.all(objName)) {  
        return document.all(objName);
    } 
    else if (document.forms && document.forms[objName]) { 
        return document.forms[objName];
    } else {
        return false;
    }
}