[Lynne]

You would add the new css into your style in Styles & Templates > sTyle Manager > find your style > Main CSS > go to the bottom of the page to Additional CSS Definitions and put the postbit_avatar CSS in there.

Then modify your postbit(_legacy) templates:

<if condition="$show['avatar']">
                <div class="smallfont">
                    &nbsp;<br /><a href="member.php?$session[sessionurl]u=$post[userid]"><img class="postbit_avatar" src="$post[avatarurl]" $post[avwidth] $post[avheight] alt="<phrase 1="$post[username]">$vbphrase[xs_avatar]</phrase>" border="0" /></a>
                </div>
            </if>