How to make search.php page, Sort Results by Relevancy by default?

[basketmen]

Hi guys,

How to make search.php page, Sort Results by Relevancy by default, instead of Last Posting Date



i check in search_forums template part below, there is no code in bold, to selected Last Posting Date by default

<fieldset class="fieldset">						
				<legend>$vbphrase[sort_results_by]</legend>
				<div style="padding:$stylevar[formspacer]px">								
					<select name="sortby">
						<option value="rank" $sortbyselected[rank]>$vbphrase[relevancy]</option>
						<option value="title" $sortbyselected[title]>$vbphrase[title]</option>
						<option value="replycount" $sortbyselected[replycount]>$vbphrase[number_of_replies]</option>
						<option value="views" $sortbyselected[views]>$vbphrase[number_of_views]</option>
						<option value="threadstart" $sortbyselected[threadstart]>$vbphrase[thread_start_date]</option>
						<option value="lastpost" $sortbyselected[lastpost]>$vbphrase[last_posting_date]</option>
						<option value="postusername" $sortbyselected[postusername]>$vbphrase[username]</option>
						<option value="forum" $sortbyselected[forum]>$vbphrase[forum]</option>
					</select>
					<select name="order">
						<option value="descending" $sortorderselected[descending]>$vbphrase[in_descending_order]</option>
						<option value="ascending" $sortorderselected[ascending]>$vbphrase[in_ascending_order]</option>
					</select>
				</div>
			</fieldset>

please help to do that give a clue, or if there is setting for that