function subNavigation(){
	
	$('ul.about-sub').css({height:'1px'});
	$('ul.services-sub').css({height:'1px'});
	$('ul.casestudies-sub').css({height:'1px'});
	
	// Animate the about sub menu
	$('.nav li.about').mouseenter(function() {
		$('ul.about-sub')
		.css({visibility:'visible'})
		.animate({height:'30px'},300);
	});
	
	$('.nav li.about').mouseleave(function() {
		$('ul.about-sub')
		.css({height:'1px',visibility:'hidden'});
	});
	
	
	// Animate the services sub menu
	$('.nav li.services').mouseenter(function() {
		$('ul.services-sub')
		.css({visibility:'visible'})
		.animate({height:'30px'},300);
	});
	
	$('.nav li.services').mouseleave(function() {
		$('ul.services-sub')
		.css({height:'0px',visibility:'hidden'});
	});
	
	// Animate the casestudies sub menu
	$('.nav li.casestudies').mouseenter(function() {
		$('ul.casestudies-sub')
		.css({visibility:'visible'})
		.animate({height:'30px'},300);
	});
	
	$('.nav li.casestudies').mouseleave(function() {
		$('ul.casestudies-sub')
		.css({height:'0px',visibility:'hidden'});
	});
	
	

}