the elements in your first form are not named.
try using this form code instead:
<form method="post" id="searchform" action="results.php">
<div class="search">
<input type="text" class="box" id="searchbox" name="searchbox" />
<input type="submit" class="btn" title="Search" id="searchbtn" name="searchbtn" value="Search" />
</label>
</div>
</form>