var popupWin;		// contains handle to a "popup" window
// FUNCTION newWindow - open a new browser window
function newWindow( URL, winName, winParms, width, height, reloadParent ) {
   winParms += ( ( winParms != "" ) ? "," : "" ) + "width=" + String( width ) + ",height=" + String( height );
   if ( parseInt( navigator.appVersion, 10 ) >= 4 ) {
      // center the new window in browsers version 4 and above
      var xTop = screen.width/2 - ( width/2 );
      var yTop = screen.height/2 - ( height/2 ); 
     winParms += ",left=" + String( xTop ) + ",top=" + String( yTop );
   }
   // close the "popup" window if it is already open 
   if ( !( !popupWin || popupWin.closed ) ) { popupWin.close() }
  
   // open a "popup" window
   popupWin = window.open( URL, winName, winParms );
   if ( reloadParent == "true" ) {
      // reload parent window
      popupWin.opener.history.go(-1)
   }
   popupWin.focus()
}