function powieksz(fname, s, w)
{
	wys = w + 5;
	szer = s + 25;
	  if(window.screen){
		aw=screen.availWidth;
		ah=screen.availHeight;
	  }else{
		aw=640;
		ah=450;
	  }
	  if (szer>800) szer = 830;
	  if (wys>600) wys = 630;
	str = fname;
	var win = window.open(str,"zoom","width="+szer+", height="+wys+", left="+(aw-szer)/2+", top="+ (ah-wys)/2+", titlebar=no, status=no, toolbar=no, menubar=no, location=no, resizable=yes, scrollbars=yes, fullscreen=no");
	win.focus();
}