function najeti_leve_menu(id){
	document.getElementById('kategorie_' + id).style.backgroundColor= '#59492C';
	document.getElementById('sipka_'+ id).src= 'layout/menu_sipka_tmava.jpg';
}

function odjeti_leve_menu(id){
	document.getElementById('kategorie_' + id).style.backgroundColor= '#4B3D21';
	document.getElementById('sipka_'+ id).src= 'layout/menu_sipka_svetla.jpg';
}

function zmena_barvy_admin(theSelect,typ){
selindex = theSelect.selectedIndex;
 selvalue = theSelect.options[selindex].value;
 document.getElementById('barevnej_div_'+typ).style.backgroundColor = selvalue;
}
 
    var ActOpacity = 0;
    var ImgOpacity;
    function NextOpacity()
    {
      var objImage = document.getElementById('lista_pod_menu');
      if (objImage.style.opacity != null)
        objImage.style.opacity = ActOpacity/100;
      else if (objImage.style.filter != null)
        objImage.style.filter = "alpha(opacity="+ActOpacity+")";
      ActOpacity = ActOpacity+4;
    
      if (ActOpacity <= 100)
      {
        ImgOpacity = objImage;
        setTimeout('NextOpacity(ImgOpacity)',100);
      }
      if (ActOpacity > 100){
		PreviousOpacity();
	}
    }