function opencam()
{
  var posT=(screen.height-322)/2;
  var posL=(screen.width-368)/2;
  window.open("http://www.the-gang.ch/cam/index.html", "", "menubar=no,scrollbars=no,directories=no,resizable=no,status=no,left="+posL+",top="+posT+",width=368,height=322");
}