var obrazek=0;
var pocet=2;
function opacity(id, o) {
    document.getElementById('velky-'+id).style.opacity = (o / 100);
    document.getElementById('velky-'+id).style.MozOpacity = (o / 100);
    document.getElementById('velky-'+id).style.KhtmlOpacity = (o / 100);
    document.getElementById('velky-'+id).style.filter = 'alpha(opacity=' + o + ')';
}
function zmena(id,o,status){
	if(status==1){
		o--;
		if(o==0){
		document.getElementById('velky-'+id).style.display = "none";
		//	document.getElementById("velky-"+id).style.visibility = "hidden";
			//document.getElementById("velky-"+id).style.position = "relative";
		}
	} else if(status==0){
		o++;
	}
	opacity(id,o);
	if(o!=100 && o !=0){
		setTimeout("zmena("+id+","+o+","+status+")", 5);
	}
}
function zmen(id,predchozi,stop){
	obrazek = id;
	if(stop==1){
		obrazek--;
	}
	ob = id;
	if(predchozi==''){
		if(ob==1){
 			ob = pocet+1;
		}
		zmena((ob-1),'100','1');
	}else{
		zmena(predchozi,'100','1');
	}
	document.getElementById('velky-'+id).style.display = "block";
	//document.getElementById("velky-"+id).style.visibility = "visible";
	//document.getElementById("velky-"+id).style.position = "absolute";
	zmena(id,'0','0');
}
function odpocet(){
	cas = 5000;
	if(obrazek==pocet){
		obrazek=0;
	}
	obrazek++;
	zmen(obrazek,'');
	aktivni = setTimeout('odpocet()', cas);
}