If you click on MMA Online in the header, it displays correctly in IE 7 but not right in firefox. Does anyone know why it would be doing this?

I'm using the following code for the DIV

HTML Code:
<DIV id="subcontent" style="position:absolute; margin-top: 21px; background-color: #890105; width: 200px; color: #FFFFFF; padding: 8px; display:none; font-size: 8.5pt">

<a class="network" href="#"><b>MMA Blogs</b></a><br>Create your own blog with 3 easy steps!<br>
<div align="right"><a class="network" href="#" onClick="overlayclose('subcontent'); return false">Close</a></div>

The actual script is from

Thanks in advance for the help!