I am using a HTML/Java comment box that has an outgoing link next to it, and this link will appear on every page I put the comment box.

How will this affect my Pagerank?

Is there any way to make this code NOdofollow?
Any help much appreciated, thanks.

Too many outgoing links tend to leak linkjuice, damaging your page rank, adding nofollow tends to plug that link.

do follow link
<a href="hxxp://www.yahoo.com/page.html">Click Here</a>

modified for nofollow
<a href="hxxp://www.yahoo.com/page.html" rel="nofollow">Click Here</a>

hxxp to reduce spam resemblance