$hDB = @mysql_connect($HOST,$USER,$PASS)
or die("Ошибка: Connect_error.");
mysql_select_db($dbName)
or die("Ошибка: Select_DB");
$res = mysql_query("SELECT id FROM "._PREFIX_."_user WHERE name='".$_REQUEST['in_login']."' AND passw ='".md5($_REQUEST['in_pass'])."'");
$row = mysql_fetch_array($res);
mysql_free_result($res);
mysql_close($hDB);