function getById(id)
{
	if (document.getElementById) return document.getElementById(id);
	else if (document.all) return document.all[id];
	return null;
}

function winopen(plik, w, h, scroll)
{

	if(window.screen) {
	  aw=screen.availwidth;
	  ah=screen.availheight;
	}else{
	  aw=640;
	  ah=450;
	}
	 ustawienia=
	 "left="+(aw-w)/2+","
	 +"top="+(ah-h)/2+","
	 +"screenX="+(aw-w)/2+","
	 +"screenY="+(ah-h)/2+","
	 +"width="+w+","
	 +"height="+h+","
	 +"toolbar=no,"
	 +"location=no,"
	 +"directories=no,"
	 +"status=np,"
	 +"menubar=no,"
	 +"scrollbars="+scroll+","
	 +"name="+plik+","
	 +"resizable=no";
	 noweokno=window.open(plik,
	 	('o_' + Math.random (100)).replace ('.','_'),
	 	ustawienia);
	 return noweokno;
}