function getObj(name) {
    if (document.getElementById) {
        this.obj = document.getElementById(name);
        this.style = document.getElementById(name).style;
    } else if (document.all) {
        this.obj = document.all[name];
        this.style = document.all[name].style;
    } else if (document.layers) {
        this.obj = document.layers[name];
        this.style = document.layers[name];
    } // if
} // getObj(name)

function visib(objName, flag) {
    x = new getObj(objName);
    x.style.display = (flag) ? 'block' : 'none';
} // visib(objName, flag)

function showmenu(m) {
    for (i in menus) {
        visib(menus[i],false);
    }
    visib(m,true);
} // showmenu(m)