var isLayers = 0; var isAll = 0; var isDHTML = 0;
var dom = null; var oldDom = null;
if (document.layers) { isLayers = 1; isDHTML = 1;}
if (document.all) {isAll = 1; isDHTML = 1;}
docObj = (isLayers) ? 'document' : 'document.all';
styleObj = (isLayers) ? '' : '.style';

function popMenu(currElem){

        if (oldDom) { oldDom.visibility = "hidden"; }
        dom = eval(docObj + '.' + currElem + styleObj);
        if (oldDom != dom) {
                state = dom.visibility;
                        if (state == "visible" || state == "show") {dom.visibility = "hidden"

                        } else { dom.visibility = "visible" }

        }

        if (oldDom != dom) { oldDom = dom; }
        else { oldDom = null; }

}