var myTWin = window.myTWin; 

function OpenMyWin(link,winName) 
{ 
  var retValue=true; 
  if (myTWin!=null && !myTWin.closed) 
  { 
    myTWin.focus(); 
    myTWin.location.href=link.href; 
  } 
  else 
  { 
    myTWin=window.open(link.href,winName); 
    if (myTWin==null || typeof(myTWin)=="undefined") 
      retValue=false; 
    else 
    { 
      link.target=winName; 
      myTWin.focus(); 
    } 
  } 
  return retValue; 
}