Trying to click on image which is a part of WebElement with Tag 'NOBR'

[poona13]

There is a web element(part of webtable) with tag 'NOBR' in my web application.
If I look at the Web Element in IE Dev Toolbar, it looks like this:

Code:

<TD class=xyz id=abc>
--<NOBR>
----<IMG>
----#text
----<IMG class=navnode>
------class=navnode
------src=http://...
----#text
----<IMG>
----#text

The issue is that I want to click on the image of class=navnode.
Not sure how to get to it...
How can I access it using the WebElement?