[Javascript] Dynamic resizing of a popup depending of the content

[Denti Xavier]

Hi all, 

I using a image button that is at the bottom of my popup.

	<a href="javascript:window.close();"><img border="0"
src="../img/btn_close.gif" width="60" height="12" name="btn_close"></a> 

To find it's position I use :

	popUpHeight = (200)+btn_close.offsetParent.offsetTop

	window.resizeTo(320,popUpHeight);

and this gives me the distance from the top of the popup wich I add to
the minimum size (200) I defined. 
It works fine under IE, but not under Netscape, where it says btn_close
not defined.

If anybody has an idea... 

Xavier