Need help in form post

[eluser]Unknown[/eluser]
<form name="frmsearch" action="index.php/search" method="post">
<label>Search</label>
&lt;input type="text" id="keyword" name="keyword" value="&lt;?php echo @$keyword ?&gt;" /&gt;
&lt;input type="submit" name="btnSubmit" class="go" value="" /&gt;
&lt;input type="hidden" name="post" value="true" /&gt;
&lt;/form&gt;

When submitted above .. CI don't retrieve form values. Gives error message
Severity: Notice
Message: Undefined index: keyword

Please help...its really urgent.

Thanks!
Nitin