function contactwindow(){
  w=590;
  h=320;
  TopPosition=(screen.height)?(screen.height-h)/2:100;
  LeftPosition=(screen.width)?(screen.width-w)/2:100;
  window.open("",'form', 'width='+w+',height='+h+',top='+TopPosition+',left='+LeftPosition+';marginwidth=0,marginheight=0,location=no,directories=no,status=no,menubar=no,toolbar=no,addressbar=no,resizable=no');
}