Best approach for link button to member's profile?

I have a social network site, and want to boost my home page ranking.

To do this, I want to provide some html for users to link back to their profiles.

Ideally, the link should point to: mysite.com.

However, user profiles live on a subpage: mysite.com/profile.php?user=trex.

Will a link to a subpage, still pass PR to the home page (through its link to the home page)?

For example:
<a href="http://mysite.com/profile.php?user=trex"><img ...></a>

Is there a better way to do this?

Thanks in advance!

 

if you dont want search engines to not follow a link, try to add nofollow