function doSub(theSub){

    hideAllSubMenus('asub');

    document.getElementById(theSub + "_sub").style.display = "block";

}

var allTags = new Array();

function hideAllSubMenus(theSubMenuClassName){

    var allTags = document.getElementsByTagName("*");

    for (i = 0; i < allTags.length; i++){

        if (allTags[i].className == theSubMenuClassName){

            allTags[i].style.display = "none";

        }

    }

}