[bridge2heyday]

you should return value not echo

PHP Code:

$query = "SELECT team_id, win, loss FROM match_results WHERE season_id=12";  
$result = mysql_query($query); 

$output = "<table>";  

while($row = mysql_fetch_array($result)){    
$output .= "<tr><td>" . $row['Team'] . "</td><td>" . $row['Wins'] . "</td><td>"  .$row['Losses'] . "</td></tr>"; 
} 

$output .= "</table>";  
return $output; 


you should also avoid using the depreciated MySQL extension , you can use vBulletin database class.
for example

PHP Code:

$myquery =  vB::$db->query_read("SELECT team_id, win, loss FROM match_results WHERE season_id=12");