// Popup window function
	function basicPopup(url) {
popupWindow = window.open(url,'popUpWindow','height=500,width=500,left=100,top=100,resizable=yes,scrollbars=yes,toolbar=yes,menubar=no,location=no,directories=no, status=yes');
	}

<a href="http://www.saitas.lt/failas.php" onclick="basicPopup(this.href);return false">Atidarom failą popup lange</a>