function zoom(plik)
{
o = null;
if(window.screen)
{aw = screen.availWidth;ah = screen.availHeight;}else{aw=640,ah=480}
u="width=600,height=380,left="
+(aw-800)/2+",top="
+ (ah-680)/2 
+",toolbar=no,location=no,directories=no,"
+"status=no,menubar=no,"
+"scrollbars=yes,resizable=no";
o=window.open(plik,'zoom',u);
}