Safari Browser does not play well with vbulletin forums (save login?)!

The cruisecritic board ( http://boards.cruisecritic.com/showthread.php?t=585458) documents the failure in both the Mac and PC versions of Safari.
I think the PHP source code for the vbulletin code is:
<!-- login form -->
<form action="login.php?do=login" method="post" onsubmit="md5hash(vb loginpassword, vb loginmd5password, vb login_md5passwordutf, 0)">
<script type="text/javascript" src="clientscript/vbulletin_md5.js?v=364"></script>
<table cellpadding="0" cellspacing="3" border="0">
<tr>
<td class="smallfont"><label for="navbar_username">User Name</label></td>
<td align="right"><input type="text" class="bginput" style="font-size: 11px" name="vb loginusername" id="navbar_username" size="10" accesskey="u" tabindex="101" value="User Name" onfocus="if (this.value == 'User Name') this.value = '';" /></td>
</tr>
<tr>
<td class="smallfont"><label for="navbar_password">Password</label></td>
<td align="right"><input type="password" class="bginput" style="font-size: 11px" name="vb loginpassword" id="navbar_password" size="10" tabindex="102" /></td>
</tr>
<tr>
<td colspan="2" class="smallfont" nowrap="nowrap">
<label for="cb cookieusernavbar"><input type="checkbox" name="cookieuser" value="1" tabindex="103" id="cb cookieusernavbar" accesskey="c" />Remember Me?</label>
<input type="submit" class="button" value="Log in" tabindex="104" title="Enter your username and password in the boxes provided to login, or click the 'register' button to create a profile for yourself." accesskey="s" />
</td>
</tr>
<tr><td colspan="2" class="smallfont"> </td></tr>
<!-- start of adding register and lost password links -->
<tr>
<td colspan="2" class="smallfont">
Register here!
</td>
</tr>
<tr>
<td colspan="2" class="smallfont">
Forgot Your Password?
</td>
</tr>
<!-- end of adding register and lost password links -->
</table>
<input type="hidden" name="s" value="" />
<input type="hidden" name="do" value="login" />
<input type="hidden" name="vb loginmd5password" />
<input type="hidden" name="vb login_md5passwordutf" />
</form>
<!-- / login form -->

</td>



</tr>
</table>
<!-- / breadcrumb, login, pm info -->


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