page_id = null;
urlquery = location.href.split("?");
urlterms = urlquery[1].split("page_id=");
page_id = urlterms[1];

function dhtmlNav(arg, url) {
    if (!arg) return false;
    if ((document.getElementById) && (!url)) {
        var i = 1;
        while (document.getElementById("dhtml-" + i)) {
            if (i == arg) {
                document.getElementById("dhtml-" + i).style.display = 
                    (document.getElementById("dhtml-" + i).style.display == "block") ?
                    "none" : "block";
            }
            else {
                document.getElementById("dhtml-" + i).style.display = "none";
            }
            i ++;
        }
    }
    else {
        location.href = url + "?page_id=" + arg;
    }
}