Well, those error normaly appear when you've got something wrong in your sql 
statement.  Make sure there is some information stored in your database, 
empty tables are sometimes troublesome.

What do you use $link for?

$sql =  "select USUARIO from docente where USUARIO = '$usuario'";
$result = mysql_query($sql, $link);
if (mysql_num_rows($result) == 1)


                         Wilmar Pérez
                     Network Administrator
                       Library System
                      Tel: ++57(4)2105145
                    University of Antioquia
                       Medellín - Colombia

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