adding alt text to right sidebar images in topic listing

public/templates/category.tpl

@@ -46,7 +46,7 @@
 			</div>
 			<div class="block-content">
 				<!-- BEGIN active_users -->
-				<a href="/users/{active_users.username}"><img style="width: 48px; height: 48px; /*temporary*/" src="/graph/users/{active_users.username}/picture" class="img-polaroid" /></a>
+				<a href="/users/{active_users.username}"><img title="{active_users.username}" style="width: 48px; height: 48px; /*temporary*/" src="/graph/users/{active_users.username}/picture" class="img-polaroid" /></a>
 				<!-- END active_users -->
 			</div>
 		</div>
@@ -56,7 +56,7 @@
 			</div>
 			<div class="block-content">
 				<!-- BEGIN moderators -->
-				<a href="/users/{moderators.username}"><img style="width: 48px; height: 48px; /*temporary*/" src="/graph/users/{moderators.username}/picture" class="img-polaroid" /></a>
+				<a href="/users/{moderators.username}"><img title="{moderators.username}" style="width: 48px; height: 48px; /*temporary*/" src="/graph/users/{moderators.username}/picture" class="img-polaroid" /></a>
 				<!-- END moderators -->
 			</div>
 		</div>