if( document.images )
{
<!--On & Off-->
  uvod = new Image(80,28) ;
  uvod.src = "images/uvod.jpg";
  uvod1 = new Image(80,28) ;
  uvod1.src = "images/uvod1.jpg";
  status_servru = new Image(80,28) ;
  status_servru.src = "images/status_servru.jpg";
  status_servru1 = new Image(80,28) ;
  status_servru1.src = "images/status_servru1.jpg";
  forum = new Image(80,28) ;
  forum.src = "images/forum.jpg";
  forum1 = new Image(80,28) ;
  forum1.src = "images/forum1.jpg";
  novinky = new Image(80,28) ;
  novinky.src = "images/novinky.jpg";
  novinky1 = new Image(80,28) ;
  novinky1.src = "images/novinky1.jpg";
  registrace = new Image(80,28) ;
  registrace.src = "images/registrace.jpg";
  registrace1 = new Image(80,28) ;
  registrace1.src = "images/registrace1.jpg";
  kontakty = new Image(80,28) ;
  kontakty.src = "images/kontakty.jpg";
  kontakty1 = new Image(80,28) ;
  kontakty1.src = "images/kontakty1.jpg";
  pravidla = new Image(80,28) ;
  pravidla.src = "images/pravidla.jpg";
  pravidla1 = new Image(80,28) ;
  pravidla1.src = "images/pravidla1.jpg";
  galerie = new Image(80,28) ;
  galerie.src = "images/galerie.jpg";
  galerie1 = new Image(80,28) ;
  galerie1.src = "images/galerie1.jpg";
  soubory = new Image(80,28) ;
  soubory.src = "images/soubory.jpg";
  soubory1 = new Image(80,28) ;
  soubory1.src = "images/soubory1.jpg";
  ucebni_plan = new Image(80,28) ;
  ucebni_plan.src = "images/ucebni_plan.jpg";
  ucebni_plan1 = new Image(80,28) ;
  ucebni_plan1.src = "images/ucebni_plan1.jpg";
  pametni_sin = new Image(80,28) ;
  pametni_sin.src = "images/pametni_sin.jpg";
  pametni_sin1 = new Image(80,28) ;
  pametni_sin1.src = "images/pametni_sin1.jpg";
  rozvrzeni_roku = new Image(80,28) ;
  rozvrzeni_roku.src = "images/rozvrzeni_roku.jpg";
  rozvrzeni_roku1 = new Image(80,28) ;
  rozvrzeni_roku1.src = "images/rozvrzeni_roku1.jpg";
  rozvrh_hodin = new Image(80,28) ;
  rozvrh_hodin.src = "images/rozvrh_hodin.jpg";
  rozvrh_hodin1 = new Image(80,28) ;
  rozvrh_hodin1.src = "images/rozvrh_hodin1.jpg";
  seznam_studentu = new Image(80,28) ;
  seznam_studentu.src = "images/seznam_studentu.jpg";
  seznam_studentu1 = new Image(80,28) ;
  seznam_studentu1.src = "images/seznam_studentu1.jpg";
  profesorsky_sbor = new Image(80,28) ;
  profesorsky_sbor.src = "images/profesorsky_sbor.jpg";
  profesorsky_sbor1 = new Image(80,28) ;
  profesorsky_sbor1.src = "images/profesorsky_sbor1.jpg";
  instalace = new Image(80,28) ;
  instalace.src = "images/instalace.jpg";
  instalace1 = new Image(80,28) ;
  instalace1.src = "images/instalace1.jpg";
  o_projektu = new Image(80,28) ;
  o_projektu.src = "images/o_projektu.jpg";
  o_projektu1 = new Image(80,28) ;
  o_projektu1.src = "images/o_projektu1.jpg";
  faq = new Image(80,28) ;
  faq.src = "images/faq.jpg";
  faq1 = new Image(80,28) ;
  faq1.src = "images/faq1.jpg";
  kouzelnicky_svet = new Image(80,28) ;
  kouzelnicky_svet.src = "images/kouzelnicky_svet.jpg";
  kouzelnicky_svet1 = new Image(80,28) ;
  kouzelnicky_svet1.src = "images/kouzelnicky_svet1.jpg";
  bradavice = new Image(80,28) ;
  bradavice.src = "images/bradavice.jpg";
  bradavice1 = new Image(80,28) ;
  bradavice1.src = "images/bradavice1.jpg";
  kouzelnicke_predmety = new Image(80,28) ;
  kouzelnicke_predmety.src = "images/kouzelnicke_predmety.jpg";
  kouzelnicke_predmety1 = new Image(80,28) ;
  kouzelnicke_predmety1.src = "images/kouzelnicke_predmety1.jpg";
  ostatni_predmety = new Image(80,28) ;
  ostatni_predmety.src = "images/ostatni_predmety.jpg";
  ostatni_predmety1 = new Image(80,28) ;
  ostatni_predmety1.src = "images/ostatni_predmety1.jpg";
  role_playing = new Image(80,28) ;
  role_playing.src = "images/role_playing.jpg";
  role_playing1 = new Image(80,28) ;
  role_playing1.src = "images/role_playing1.jpg";
  kouzelni_tvorove = new Image(80,28) ;
  kouzelni_tvorove.src = "images/kouzelni_tvorove.jpg";
  kouzelni_tvorove1 = new Image(80,28) ;
  kouzelni_tvorove1.src = "images/kouzelni_tvorove1.jpg";
  ovladani_hry = new Image(80,28) ;
  ovladani_hry.src = "images/ovladani_hry.jpg";
  ovladani_hry1 = new Image(80,28) ;
  ovladani_hry1.src = "images/ovladani_hry1.jpg";
  harmonogram = new Image(80,28) ;
  harmonogram.src = "images/harmonogram.jpg";
  harmonogram1 = new Image(80,28) ;
  harmonogram1.src = "images/harmonogram1.jpg";
  
<!--Add additional sets as needed-->
}<!--
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")
}
function swBox(box,obr1,obr2,hodnota) {
  o1 = document.getElementById(obr1).src;
  o2 = document.getElementById(obr2).src;
  if (hodnota==0){
    document.getElementById(obr1).src="images/m1.jpg";
    document.getElementById(obr2).src="images/z0.jpg";
    document.getElementById(box).value="muz";
  }
  else {
    document.getElementById(obr1).src="images/m0.jpg";
    document.getElementById(obr2).src="images/z1.jpg";
    document.getElementById(box).value="zena";
  }
  //document.getElementById(box).value =;
}
//-->