function openWin(img, arg1, arg2) {
  winId = window.open('','newwin','width=' + arg1 + ',height=' + arg2 + "'");
  winId.document.write('<head><title>screenshot</title></head>');
  winId.document.write('<body leftmargin=0 topmargin=0 marginheight=0 marginwidth=0 onLoad="if (window.focus) window.focus()"><center>');
  winId.document.write('<img src="' + img + '" onclick="self.close()">');
  winId.document.write('</center></body>');
  winId.document.close();
}