[Webtest] Problem with input element of type="image"

[webtest@lists.canoo.com]

Hi all,

Having following HTML code in my JSP,

	<input type="image" name="btn_open" src="/images/btn_open.gif"
border="0" alt="open">

I can submit my form with the following webtest element:

	<clickbutton stepid="Click 'Open forecast'"  name="btn_open" />

When the form get submitted, the two parameters 'btn_open.x' and
'btn_open.y' should be
available on the request, but they are not.

Am'I missing something?

Thanks
Robert