obr = -1; cas = 4000; function animation(){
obrazky = ["/img/kotel.jpg","/img/ohrivac.jpg","/img/sporak.jpg","/img/topidlo.jpg"];
if (obr+1==obrazky.length) obr=0;
else {obr++; obrazek.src = obrazky[obr];}
window.setTimeout('animation()',cas);}