function openPopup(url, width, height)
{
  if (width == undefined)
  {
    width = 800;
  }
  if (height == undefined)
  {
    height = 600;
  }
  
  w = window.open(url, "popup", "status=1, toolbar=0, location=0, menubar=0, directories=0, resizable=1, scrollbars=1, width="+width+", height="+height);

  if (window.focus)
  {
    w.focus();
  }
}