Memberlist Search

[Boofo]

Can anyone please tell me how to make the following code to a partial serach for a member instead of having to have the full member name first?

if ($action=="quickfind") {
	$usernamecheckq = $DB_site->query("SELECT userid FROM user WHERE username='".addslashes(htmlspecialchars($membername))."'");
	$usernamecheck = mysql_fetch_array($usernamecheckq);
if (!$usernamecheck[userid]) {
	eval("standarderror(\"".gettemplate("error_invalidusername")."\");");
	exit; }
$goto="member.php?s=$session[sessionhash]&action=getinfo&userid=$usernamecheck[userid]";
eval("standardredirect(\"".gettemplate("redirect_memberfound")."\",\"$goto\");");
}