How do I change the reputation scales image after someone has given reputation?

[Zacarias]

I wanted to let the user know what posts he or she had given reputation to by showing a different image in place of the scales (or whatever it may be) on the postbit.

I tried making a plugin, and failed miserably. I added the following to the hook "reputation_add_complete":

PHP Code:

if ($db->affected_rows() > 0)
    {
        $usergivenrep = 1;
    } 


Then, in the postbit_legacy template (the one I'm using), I would have an if conditional that would display the different image.

It's my first time coding so.. I need some help..