Get highest element of a class of each containing parent element, and give all elements in this parent element this height. Uses jQuery.

same_height.js

function sameHeight(target) {
	// Reset
	$(target).each(function() {
		$(this).parent().data('height', 0);
	});
	// Get highest element of each containing parent element
	$(target).each(function() {
		if ($(this).parent().data('height') < $(this).height()) {
			$(this).parent().data('height', $(this).height());
		}
	});
	// Give all elements in a parent the same maximum height
	$(target).each(function() {
		$(this).height(
			$(this).parent().data('height')
		);
	});
}