function PopupWindow(url,width,height,name){
    if (name==null){
      name = new String(Math.round(Math.random()*10000000));
    }
    var left = (screen.width - width)/2;
    var top = (screen.height - height)/2 - 18;

    var win = window.open(url,name,"toolbar=no,location=no,directories=no,"+
      "status=no,menubar=no,scrollbars=no,resizable=no,"+
      "copyhistory=no, width="+width+",height="+height+",left="+left+",top="+top);
}