function okno_popup(xzdjecie)
{

 var xWin=(screen.availWidth-10);
 var yWin=(screen.availHeight-29);
 var x=670;
 var y=450;
 var xscrepos=((xWin-x)/2);
 var yscrepos=((yWin-y)/2);

 window.open              (xzdjecie,'popup','scrollbars=yes,status=no,toolbar=no,menubar=no,height='+y+',width='+x+',left='+xscrepos+',top='+yscrepos);
}

function okno_popup1(xzdjecie)
{

 var xWin=(screen.availWidth-10);
 var yWin=(screen.availHeight-29);
 var x=670;
 var y=650;
 var xscrepos=((xWin-x)/2);
 var yscrepos=((yWin-y)/2);

 window.open              (xzdjecie,'popup','scrollbars=yes,status=no,toolbar=no,menubar=no,height='+y+',width='+x+',left='+xscrepos+',top='+yscrepos);
}