var popPage = null;

function openPopPage(pageName)
 {
 closePopPage();
 winfmt = "toolbar=yes,scrollbars=yes,resizable=yes,width=500,height=400";
 popPage = window.open( pageName, "popPage", winfmt );
 }

function closePopPage()
 {
 if ( navigator.appName != "Microsoft Internet Explorer" || parseInt(navigator.appVersion) >=4 )
  { 
  if( popPage != null ) 
   { 
   if( !popPage.closed ) 
    { popPage.close(); } 
   } 
  }
 }