$(document).ready(function() {

	$(".drop_down li").hover(
		function() {
			$('ul', this).slideDown(100);
		},

		function() {
			$('ul', this).slideUp(100);
		}
	);
	
	
	function equalHeight(group) {
		var tallest = 0;
	
		group.each(function() {
			var thisHeight = $(this).height();
			if(thisHeight > tallest) {
				tallest = thisHeight;
			}
		});
		group.height(tallest);
	};
	
	equalHeight($(".equalise"));
	
});