function OpenWindowChat() {
  var w = Math.floor((screen.width-780)/2)-6;
  var h = Math.floor((screen.height-505)/2)-15;
    winarchat=window.open("chat.htm","","toolbar=no,scrollbars=no,directories=no,status=no,menubar=no,resizable=yes,width=780,height=505" + ",top=" + h + ",left=" + w) }