function Sk(prvek) {
var x=document.getElementById(prvek);
x.style.visibility="hidden";
}

function Uk(prvek) {
var x=document.getElementById(prvek);
x.style.visibility="visible";
}

function openWinGal() {
window.open("","foto",'toolbar=0,location=0,scrollbars=yes,width=400,height=500,resizable=1,top=20,left=20');
}