html caixinhas hover

<div id="sidebar">
<div class="desc">
{block:ifShowTitle}<center>
<div class="blogtitle"><a href="/">sidebar #1</a></div></center><br>{/block:ifShowTitle}
<div style="overflow: auto; auto; height: 150px; margin-top: 2px;"><center>{Description}</center></div><br/>
</div>
<img src="http://static.tumblr.com/k8dklpx/E3Fmdymie/2.png" width=200px></div>

<div id="sidebar2">
<div class="desc">
{block:ifShowTitle}<center>
<div class="blogtitle"><a href="/">sidebar #2</a></div></center><br>{/block:ifShowTitle}
<center>{Description}</center>
</div>
<img src="http://static.tumblr.com/k8dklpx/E3Fmdymie/2.png" width=200px></div>

<div id="sidebar3">
<div class="desc">
{block:ifShowTitle}<center>
<div class="blogtitle"><a href="/">sidebar #3</a></div></center><br>{/block:ifShowTitle}
<center>{Description}</center>
</div>
<img src="http://static.tumblr.com/k8dklpx/E3Fmdymie/2.png" width=200px></div>

<div id="sidebar4">
<div class="desc">
{block:ifShowTitle}<center>
<div class="blogtitle"><a href="/">sidebar #4</a></div></center><br>{/block:ifShowTitle}
<center>{Description}</center>
</div>
<img src="http://static.tumblr.com/k8dklpx/E3Fmdymie/2.png" width=200px></div>

<div id="sidebar5">
<div class="desc">
{block:ifShowTitle}<center>
<div class="blogtitle"><a href="/">sidebar #5</a></div></center><br>{/block:ifShowTitle}
<center>{Description}</center>
</div>
<img src="http://static.tumblr.com/k8dklpx/E3Fmdymie/2.png" width=200px></div>

<div id="sidebar6">
<div class="desc">
{block:ifShowTitle}<center>
<div class="blogtitle"><a href="/">sidebar #6</a></div></center><br>{/block:ifShowTitle}
<center>{Description}</center>
</div>
<img src="http://static.tumblr.com/k8dklpx/E3Fmdymie/2.png" width=200px></div>