var okienko;
function okno_pic(adres)
{
if (!okienko || okienko.closed)
{
var left = screen.width/2 - 300;
var top = screen.height/2 - 220;
okienko = window.open("","subWindow","width=600,height=440,scrollbars,resizable,left="+ left + ",top=" + top);
var strona;
strona = "";
strona+= "Podgląd zdjęcia";
okienko.document.write(strona);
}
else
okienko.focus();
}