function openWin(file, w, h) {
                                                                                                                 
    var x = screen.availWidth;
    var y = screen.availHeight;
                                                                                                                 
    win = open(file,"open","width="+w+",height="+h+",status=no,toolbar=no,menubar=no,scrollbars=yes,screenX="+(x-w)/2+",screenY="+(y-h)/2);
                                                                                                                 
}