window.nam ="main";
    var isNav4, isIE4, isMac, isNav6;

    if( parseInt( navigator.appVersion.charAt( 0 )) >= 4) {
      isNav4 = ( navigator.appName == "Netscape" && parseInt( navigator.appVersion ) != 5 ) ? true : false
      isNav6 = ( navigator.appName == "Netscape" && parseInt( navigator.appVersion ) == 5 ) ? true : false
      isIE4 = ( navigator.appName.indexOf( "Microsoft" ) != -1 ) ? true : false
      isMac = ( navigator.platform.indexOf( "Mac" ) != -1 ) ? true : false
    }

    function doSubWin( url, winWidth, winHeight ) {
      if( isNav4 || isIE4 ) {
        var screenPosX,screenPosY;
        screenPosX = ( screen.availWidth - winWidth ) / 2;
        screenPosY = ( screen.availHeight - winHeight ) / 2;

        if( isNav4 ) {
          window.open( url, 'subwin','toolbar=0,location=1,directories=0,status=1,menubar=0,scrollbars=1,resizable=1, copyhistory=0,width=' + winWidth + ',height=' + winHeight + ',screenX=' + screenPosX + ',screenY=' + screenPosY );
        }

        if( isIE4 ) {
          newwin = window.open( url, 'subwin','toolbar=0,location=1,directories=0,status=1,menubar=0,scrollbars=1,resizable=1, copyhistory=0,width=' + winWidth + ',height=' + winHeight + ',left=' +screenPosX+ ',top=' + screenPosY );
        }
      } else {
        window.open( url, 'subwin','toolbar=0,location=1,directories=0,status=1,menubar=0,scrollbars=1,resizable=1, copyhistory=0,width=' + winWidth + ',height=' + winHeight );
      }
    }