problema INNER JOIN

[zacca94]

$q1 = mysql_query("
                           SELECT paure.paura
                           FROM ( paure INNER JOIN paure_persone ON idpaura INNER JOIN persone ON idpersona )
                           WHERE persone.nome = 'Mario Rossi'
                          ") or die(mysql_error());

$q2 = mysql_fetch_array($q1);

print $q2['paura']; 

errore:

Column 'idpaura' in on clause is ambiguous