$(document).ready(function() {
  $('nav div.mainLinks > div').hide();
  $('nav div.mainLinks > p').click(function(event) {
		var $nextDiv = $(this).next();
		var $visibleSiblings = $nextDiv.siblings('div:visible');
		if ($visibleSiblings.length ) {
		  $visibleSiblings.slideUp('medium', function() {
			$nextDiv.slideToggle('medium');
		  });
		} else {
		   $nextDiv.slideToggle('medium');
		}
		event.preventDefault();
  });
});