Look for this in the index_body.tpl file
Code:
<form method="post" action="{S_LOGIN_ACTION}">
<table width="100%" cellpadding="3" cellspacing="1" border="0" class="forumline">
<tr>
<td class="catHead" height="28"><a name="login"></a><span class="cattitle">{L_LOGIN_LOGOUT}</span></td>
</tr>
<tr>
<td class="row1" align="center" valign="middle" height="28"><span class="gensmall">{L_USERNAME}:
<input class="post" type="text" name="username" size="10" />
{L_PASSWORD}:
<input class="post" type="password" name="password" size="10" />
{L_AUTO_LOGIN}
<input class="text" type="checkbox" name="autologin" />
<input type="submit" class="mainoption" name="login" value="{L_LOGIN}" />
</span> </td>
</tr>
</table>
</form>
I think if you remove that entire block of code..that will do it...Make sure you backup that file first before you edit it just in case it goes wrong.
mikem