This below. It's get. I changed to post but does the same.
<form class="Basic_Default" id="Search_Basic_Default" name="Search_Basic_Default" method="get" action="spec_sheets_results.php">
<div class="lineGroup">
<label for="ss_keywords" class="sublabel" >Keywords:</label>
<input id="ss_keywords" name="ss_keywords" type="text" value="<?php echo((isset($_GET["ss_keywords"])?$_GET["ss_keywords"]:"")); ?>" class="formTextfield_Medium" tabindex="5" title="Please enter a value.">
</div>
attached is the file: