Pk Reset. Please help.

Hello. I want PK reseting.. I writed the code but it isn't working. :(
Please help.

Code:

	connect_db("2");
	$charidquery			= @mssql_query("SELECT * FROM dbo._User WHERE UserJID = '$kullaniciid'");
	$charidnumrows			= @mssql_num_rows($charidquery);
                            
    while($charidgit	= @mssql_fetch_array($charidquery))
	{
	$charid			= $charidgit["CharID"];
	$charbilgi		= @mssql_fetch_array(@mssql_query("SELECT * FROM dbo._Char WHERE CharID = '$Charid'"));
    $pkreset        = @mssql_fetch_array(@mssql_query("UPDATE dbo._Char SET DailyPK= '0', TotalPK= '0', PKPenaltyPoint= '0' where CharID = '$charid'"));
    }
	close_db_connection();
	?>
	<tr class="charoffline2">
	<td width="50%">PK Reseted</td>
	</tr>
	<?php