Firefox adding black border to tables

Hello everyone,

I have an issue where my page that renders OK in IE, displays a black border around many of the tables in FireFox.

The complication is that the HTML I add to this wiki is then formatted by the wiki editor itself, which is incredibly annoying. I'll post the code and if anyone has any ideas as to what I can do to have it display nicely in both browsers, it would be appreciated.

Thanks!

<img src="" /> <br />
<p>
 </p>
<table border="0" cellpadding="10" cellspacing="0" style="border: 1px solid rgb(255, 255, 255);" width="900">
<tbody>
<tr>
<td colspan="4" style="border-color: rgb(7, 29, 104) rgb(7, 29, 104) rgb(255, 255, 255) ! important; padding-left: 10px ! important; padding-right: 8px ! important; vertical-align: top ! important;">
<form action="" id="input" method="get" name="input" target="_blank">
<div align="right">
Search this Community: <input name="query" /> <input name="fieldvalue" type="hidden" value="community_id:8c9335a5-1d46-4432-b3ab-ad8b6d09bf86" /> <input class="search-button searchButton" type="submit" value="Search" /></div>
</form>
</td>
</tr>
<tr>
<td colspan="2" style="border-color: rgb(255, 255, 255) rgb(255, 255, 255) rgb(221, 221, 221) rgb(7, 29, 104) ! important; padding-left: 20px ! important; padding-right: 10px ! important; vertical-align: top ! important;">
<br />
<p>
<strong>Welcome to the Chalk Support Community! Use the community forums to collaborate with others and share information across . This wiki is a centralized spot to find and share information about all aspects of Chalk.</strong></p>
<strong><br />
</strong>
<p>

[edited by: usuf at 6:09 pm (utc) on Mar 29, 2011]