Bug??? "Duplicate entry '255' for key 1 " on auto increment

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Hi All,

I have a table problem with "Duplicate entry '255' for key 1 " when any of 
my auto increment rowID fields reaches 255

I have installed PHP Version 5.1.2 and mySQL 5.0.11-beta on Win XP Pro.

Each table in my DB that uses an auto increment for rowID fails at the 255th 
record insert.
I have redefined the field: TINYINT, INT, VARCHAR, ...  Same problem on 
several files.  They all work OK until I hit #255

Is this a bug? Have I defined my table improperly? Is there a fix?

TIA,
Mark

Here is my table defn:
$query = "CREATE TABLE $table_name (
rowID INT UNSIGNED NOT NULL AUTO_INCREMENT,
category VARCHAR(25) NOT NULL,
trans_type VARCHAR(8) NOT NULL,
PRIMARY KEY (rowID))"; 

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