1 

     2       // add randomish size classes

     3       $container.find('.element').each(function(){

     4         var $this = $(this),

     5             number = parseInt( $this.find('.number').text(), 10 );

     6         if ( number % 7 % 2 === 1 ) {

     7           $this.addClass('width2');

     8         }

     9         if ( number % 3 === 0 ) {

    10           $this.addClass('height2');

    11         }

    12       });