function dynPopup(url, w, h) {
    var u, t, l = (screen.availWidth-w)/2;
    t = (screen.availHeight-h)/2;
    u = new Date().getTime();
    vindue=window.open(url,"popup"+u,"width="+w+",height="+h+",left="+l+",top="+t+",toolbar=0,location=0,directories=0,status=no,menubar=0,scrollbars=0,resizable=0,copyhistory=0");
    vindue.focus();
}