Tooltip issue with Members Online modification


Well-known member
I modified the Members Online Now block to show avatars, just like the the Highest-Posting/Newest Members blocks are configured. However, I'm having an issue with the tooltip:

XF Online Tooltip.png
Obviously, I want the tooltip to pop out above the name, instead of getting in the way of the image when I'm hovering over it. This is the code I have in sidebar_online_users:
<xen:foreach loop="$onlineUsers.records" value="$user" i="$i">
					<xen:if is="{$i} <= {$onlineUsers.limit}">
						<xen:if is="{$user.user_id}">
							<xen:avatar user="$user" size="s" class="Tooltip" img="true" title="{$user.username}" />
						<xen:else />
							{xen:phrase guest}<xen:if is="{$i} < {$onlineUsers.limit}">,</xen:if>
Any suggestions on how to fix the tooltip? Thanks!