var extenze=".jpg"
var overpath="grafika/"
var over=new Array()
over[0]=overpath + "jjsl.gif"
//preload images
var obrpreload=new Array()
for (i=0;i<over.length;i++){
	obrpreload[i]=new Image()
	obrpreload[i].src=over[i]
}


function change_over(obr,nazev) {
	obr.src= overpath + nazev + extenze;
	return false;
}