<form action="{'?ukey=search'|set_query_html}" method="post">
{assign var=_str value='search_products'|transcape}
<input type="text" id="searchstring" name="searchstring" value='{$searchstring|default:$_str}' rel="{'search_products'|transcape}" class="input_message" />
<input type="submit" value="{'btn_find'|transcape}" />
</form>