image description on mouseover

[navidmoj]

I installed default style and still nothing

even in postbit_attachment, I have related codes

<li>
	<img class="inlineimg" src="{vb:stylevar imgdir_attach}/{vb:raw attachment.attachmentextension}.gif" alt="{vb:rawphrase file_type_x, {vb:raw attachment.attachmentextension}}" />
	<a href="attachment.php?{vb:raw session.sessionurl}attachmentid={vb:raw attachment.attachmentid}&amp;d={vb:raw attachment.dateline}"<vb:if condition="$show['newwindow']"> target="_blank"</vb:if>>{vb:raw attachment.filename}</a> 
({vb:raw attachment.filesize}<vb:if condition="$show['views']">, {vb:rawphrase x_views, {vb:raw attachment.counter}}</vb:if>)
</li>

I'm pretty sure there is no mod to mess with the title tag