Fix handling of "usemap" attribute (#1488472)

Aleksander Machniak

2012-05-12 02cf44e1838aca64e14921d30dc44d25a4d73b1c

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<?php
 
// Help content iframe source
// $rcmail_config['help_source'] = 'http://trac.roundcube.net/wiki';
$rcmail_config['help_source'] = '';