[Need Help Fetching Array Values from Database! Please! :))]

I have made an autocomplete form... originally the values were static:

 

 

$aUsers = array(

      "Adams, Egbert",

      "Altman, Alisha",

      "Archibald, Janna",

  );

 

 

Now I want the values from a database table DEVICES row name DeviceName:

 

 

$sql = "SELECT DeviceName FROM DEVICES";

$res = mysql_query($sql);

 

$aUsers = array();

while ($row = mysql_fetch_assoc($res)) {

      $aUsers[] = $row;

}

 

 

It will not display the values in my autocomplete form when text is entered.... but with static data it will. Im confused!

 

Thank you