var nbr = $$( '#podcast div:first-child' ).length -1;

  for( var i = 0; i < nbr; i++ )
   {
   $( 'emm_detail_' + i ).addEvent( 'click', function () {
     var id = this.id.substring( 11 );

     $( 'emm_descript_' + id ).toggleClass( 'show' );

     if( $( 'emm_descript_' + id ).hasClass( 'show' ))
       {
       this.set( 'html', 'détails &#9660;' );
       }
     else
       {
       this.set( 'html', 'détails &#9650;' );
       }

     });
   }