Error Connection MySql

[EarthlingZ]

Hello I have a problem with my search engien, the point with it that I can find a special word in my tabel.
Like if I have added in my tabel PHP RULEZ AND .NET SUX,
So should I find this line in the tabel when I search on sux or and.

I use MySQL 4.1.13 (xampp)
http://www.apachefriends.org/

I have the Key: in the tabel (or what its called)
ALTER TABLE adds ADD FULLTEXT namnTypFtDescript(Rubrik)

And use this line to get the information in my php-file

$_POST['search'] = $textString;

$str = "SELECT * FROM info WHERE MATCH (Rubrik) AGAINST (\"$textString\" IN BOOLEAN MODE) ORDER BY MATCH (text)";
$res = mysql_query($str) or die(mysql_error() . '<br>' . $str);
$check = mysql_fetch_array($res);

And get this error message:
You have an error in your SQL syntax.
Check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1
What do they mean wrong version? I got the newest ver. MySQL 4.1.13? dont I?

SELECT * FROM info WHERE MATCH (Rubrik) AGAINST ("" IN BOOLEAN MODE) ORDER BY MATCH (text)

Is there anyone who can help me?

[subwayman]

The first thing to try is dump out the SQL to your page BEFORE executing it, e.g. echo $str."<BR>". This will show you exactly what your sql is when executed. If it still looks OK then cut and patse it into your db admin (e.g. phpmyadmin) and run it from there. I usually do this with failing sql as it usually has better error messages.