Ye olde jQuery equal heights plugin

jquery.equalHeights.js

// jQuery plugin to create equal height elements
// Will make all elements that match the seletor the same height - matching the tallest of all of the elements.
//
// usage:
// $('.selector').equalHeights();
	
(function ( $ ) {
	$.fn.equalHeights = function(els) {
		var maxHeight = 0;
		this.each(function(){
			var elHeight = $(this).height();
			if (elHeight > maxHeight) { maxHeight = elHeight; }
		});
		this.height(maxHeight);
		return this;	
	};
})( jQuery );