thanks for replying.
here is the code (i dont know exactly where the line 255 ):
if (empty($cfgServer['port']))
$link = $connect_func($cfgServer['host'], $cfgServer['user'], $cfgServer['password']) or mysql_die();
else
$link = $connect_func($cfgServer['host'].":".$cfgServer['port'], $cfgServer['user'], $cfgServer['password']) or mysql_die();
$result = mysql_query("SELECT VERSION() AS version") or mysql_die();
$row = mysql_fetch_array($result);
define("MYSQL_MAJOR_VERSION", substr($row["version"], 0, 4));
nb: now i'm also having this problem under win98