Little jQuery plugin for spreading, or “partitioning“, elements across several parent elements. Called to create `n` partitions, the plugin wraps the selected elements at positions `c`, `n+c`, `2n+c`, `3n+c`, … into “wrapper” element for all `c` within `1`…`n`.

jquery.partition.js

(function ($) {
	$.fn.partition = function(options) {
		options = $.extend({
		  count: false,
		  wrapper : '<div>'
		}, options || {});
		var elems = $(this),
			len = pos = 0;
		for (var i = 0; i < options.count; i++) {
			var sel = elems.filter(":nth-child(" + (options.count - i) + "n)");
			sel.wrapAll(options.wrapper);
			elems = elems.not(sel);
		}
		return elems;
	};
})(jQuery);