if( document.images )
{
  menu_uvod = new Image() ;
  menu_uvod.src = "images/off_uvod.jpg";
  menu_uvod_2 = new Image() ;
  menu_uvod_2.src = "images/on_uvod.jpg";

  menu_nabizime = new Image() ;
  menu_nabizime.src = "images/off_nabizime.jpg";
  menu_nabizime_2 = new Image() ;
  menu_nabizime_2.src = "images/on_nabizime.jpg";

  menu_cenik = new Image() ;
  menu_cenik.src = "images/off_cenik.jpg";
  menu_cenik_2 = new Image() ;
  menu_cenik_2.src = "images/on_cenik.jpg";

  menu_pujcovna = new Image() ;
  menu_pujcovna.src = "images/off_pujcovna.jpg";
  menu_pujcovna_2 = new Image() ;
  menu_pujcovna_2.src = "images/on_pujcovna.jpg";

  menu_prodej = new Image() ;
  menu_prodej.src = "images/off_prodej.jpg";
  menu_prodej_2 = new Image() ;
  menu_prodej_2.src = "images/on_prodej.jpg";

  menu_partneri = new Image() ;
  menu_partneri.src = "images/off_partneri.jpg";
  menu_partneri_2 = new Image() ;
  menu_partneri_2.src = "images/on_partneri.jpg";

  menu_galerie = new Image() ;
  menu_galerie.src = "images/off_galerie.jpg";
  menu_galerie_2 = new Image() ;
  menu_galerie_2.src = "images/on_galerie.jpg";

  menu_kontakt = new Image() ;
  menu_kontakt.src = "images/off_kontakt.jpg";
  menu_kontakt_2 = new Image() ;
  menu_kontakt_2.src = "images/on_kontakt.jpg";
}
function chkVer(imagename,objectsrc)
{
var n=navigator.appName
var v=parseInt(navigator.appVersion)
var browsok=((n=="Netscape")&&(v>=3))
var browsok2=((n=="Microsoft Internet Explorer")&&(v>=4))
if ((browsok)||(browsok2))
document.images[imagename].src=eval(objectsrc+".src")
}