function otworz(url,name,w, h)
{
var l = screen.width / 2 - 800 / 2;
var t = screen.height / 2 - 600 / 2;
var Win = window.open(url,name,"toolbar=no,menubar=no, location=no, personalbar=no, status=no, resizable=yes, scrollbars=yes, copyhistory=no, width=350, height=300, left=" + l + ", top=" + t);
//Win.resizeTo(w + 10, h + 30);
Win.moveTo(l, t);
}


function repositionDiv()
{
 var x=document.getElementById(popek);

 var newLeft = getWindowWidth() / 2;
 x.style.left = newLeft + "px";
 x.style.top = 10 + "px";
}