var obrazek=0;
var pocet=5;
function opacity(id, o) {
    document.getElementById("slide"+id).style.opacity = (o / 100);
    document.getElementById("slide"+id).style.MozOpacity = (o / 100);
    document.getElementById("slide"+id).style.KhtmlOpacity = (o / 100);
    document.getElementById("slide"+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("slide"+id).style.visibility = "hidden";
}
}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;
}
zmena((ob-1),'100','1');
}else{
zmena(predchozi,'100','1');
}
//document.getElementById(id).style.display = "block";
document.getElementById("slide"+id).style.visibility = "visible";
zmena(id,'0','0');
}
function odpocet(){
cas = 7000;
if(obrazek==(pocet-1)){
obrazek=0;
}
obrazek++;
zmen(obrazek,'');
aktivni = setTimeout('odpocet()', cas);
}