Стильное адаптивное меню с поддержкой retina

<link rel="stylesheet" type="text/css" href="{tpl_url}/css/component.css" />
		<script src="{tpl_url}/js/modernizr.custom.js"></script>

<nav id="menu" class="nav">					
					<ul>
						<li>
							<a href="#">
								<span class="icon">
									<i aria-hidden="true" class="icon-home"></i>
								</span>
								<span>Home</span>
							</a>
						</li>
						<li>
							<a href="#">
								<span class="icon"> 
									<i aria-hidden="true" class="icon-services"></i>
								</span>
								<span>Services</span>
							</a>
						</li>
						<li>
							<a href="#">
								<span class="icon">
									<i aria-hidden="true" class="icon-portfolio"></i>
								</span>
								<span>Portfolio</span>
							</a>
						</li>
						<li>
							<a href="#">
								<span class="icon">
									<i aria-hidden="true" class="icon-blog"></i>
								</span>
								<span>Blog</span>
							</a>
						</li>
						<li>
							<a href="#">
								<span class="icon">
									<i aria-hidden="true" class="icon-team"></i>
								</span>
								<span>The team</span>
							</a>
						</li>
						<li>
							<a href="#">
								<span class="icon">
									<i aria-hidden="true" class="icon-contact"></i>
								</span>
								<span>Contact</span>
							</a>
						</li>
					</ul>
				</nav>

<script>
			//  The function to change the class
			var changeClass = function (r,className1,className2) {
				var regex = new RegExp("(?:^|\\s+)" + className1 + "(?:\\s+|$)");
				if( regex.test(r.className) ) {
					r.className = r.className.replace(regex,' '+className2+' ');
			    }
			    else{
					r.className = r.className.replace(new RegExp("(?:^|\\s+)" + className2 + "(?:\\s+|$)"),' '+className1+' ');
			    }
			    return r.className;
			};	

			//  Creating our button in JS for smaller screens
			var menuElements = document.getElementById('menu');
			menuElements.insertAdjacentHTML('afterBegin','<button type="button" id="menutoggle" class="navtoogle" aria-hidden="true"><i aria-hidden="true" class="icon-menu"> </i> Menu</button>');

			//  Toggle the class on click to show / hide the menu
			document.getElementById('menutoggle').onclick = function() {
				changeClass(this, 'navtoogle active', 'navtoogle');
			}

			// http://tympanus.net/codrops/2013/05/08/responsive-retina-ready-menu/comment-page-2/#comment-438918
			document.onclick = function(e) {
				var mobileButton = document.getElementById('menutoggle'),
					buttonStyle =  mobileButton.currentStyle ? mobileButton.currentStyle.display : getComputedStyle(mobileButton, null).display;

				if(buttonStyle === 'block' && e.target !== mobileButton && new RegExp(' ' + 'active' + ' ').test(' ' + mobileButton.className + ' ')) {
					changeClass(mobileButton, 'navtoogle active', 'navtoogle');
				}
			}
		</script>