var fs = null;

function DaoImg(url)
{
fs = window.open(url,"Image","location=no,resizable=yes,scrollbars=yes,width=810,height=550");
fs.focus();
return false;
//return true;
}

function focusDaoScreen()
{
  if(fs != null && fs.open && fs.focus)
    fs.focus();
}