var c_classes=new Array();
c_classes[0]="green";
c_classes[1]="maroon";
c_classes[2]="orange";
c_classes[3]="purple";

$(document).ready(function() {
  $('.content').each(function(i) {
    colour = c_classes[Math.floor(Math.random()*4)]
    $(this).addClass(colour);
    $(this).before('<div class="c_top c_top_' + colour + '"></div>');
    $(this).after('<div class="c_bottom c_bottom_' + colour + '"></div>');
    //$('.c_main').height(Math.floor(($('.c_main').height() / 25) + 1) * 25);
  });

});