layout.js

// layout for only 2 columns
function layout (container, selector) {
  var ct = container.jquery ? container : $(container);
	var themes = ct.find(selector);
	var colLeft = 0;
	var colRight = 0;
			
	// resize and position `.theme` elements
	themes.each (function (idx) {
		var elm = $(this);
		var height = elm.outerHeight();
		var deltaLeft = colLeft + height;
		var deltaRight = colRight + height;
		var isLeft;
				
		// Determine on which column put the current element
		if (deltaRight === deltaLeft) {
			isLeft = idx%2 === 0;
		} else {
			isLeft = deltaRight > deltaLeft;
		}
				
		elm.css({
			position: 'absolute',
			left: isLeft ? 0 : elm.outerWidth(),
			top: isLeft ? colLeft : colRight,
		});
				
		// increment columns height
		isLeft ? colLeft += height : colRight += height;
	});

	// apply height to the parent
	ct.height(Math.max(colLeft, colRight));
},