function mouseon(obj) { obj.style.backgroundColor = "#ffff99"; }
function mouseoff(obj) { obj.style.backgroundColor = "#ffffff"; }

/* Opens a pop-up */
function openwin(url, width, height, showMenubar, referrer) {
    var w = width;
    if (!w)
        w = 500;
    var h = height;
    if (!h)
        h = 500;

    var name = url.replace(/[\W]/g, "");
    if (referrer != null)
        url = url + '?url=' + referrer;
    var openstr = "top=100,left=100,width=" + w + ",height=" + h + ",directories=no,location=no,menubar=" + ((showMenubar) ? "yes" : "no") + ",resizable=yes,scrollbars=no,status=no,toolbar=no";
    var win = window.open(url, name, openstr);
    win.openedBy = window;
    win.focus();
}
/* returns random number */
function rand(n) {
    return (Math.floor(Math.random() * n + 1));
}