Takes a jQuery collection and wraps each x items with element y

jquery.wrapInChunks.js

/**
 * takes a jQuery collection and wraps each x items with element y
 * kinda nasty looking though
 * Example: $('#foo').children().wrapInChunks('<div></div>', 2);
 * would wrap every 2 children of #foo with a div
 */
jQuery.fn.wrapInChunks = function(html, chunkSize) {
    chunkSize = chunkSize || 1;
    var items = this.get(),
        rows = [],
        cur = rows[0] = html,
        amount = this.length,
        helper = function(times, $el) {
          var $that = $el;
          while (times--) {
            $that = $that.prev();
            $el = $el.add($that[0]);
          }
          return $el;
        };
    return this.each(function(i, el) {
      var $this = $(this);
      i++;
      if (i % chunkSize == 0) {
        var num = chunkSize,
            $that = $this;
        $this = helper(num, $that);
        $this.wrapAll(html);
      }
      else {
        if (i == amount) {
          var num = i % chunkSize -1,
              $that = $this;
          $this = helper(num, $that);
          $this.wrapAll(html);
        }
      }
    });
};