rwd.js

(function($) {
    $(document).ready(function() {

		window.onresize = function(){
		    var agent = navigator.userAgent;
		    var current_width = window.innerWidth;
		    var html = document.getElementsByTagName('html')[0];
		    if (agent.match(/Android.*Mobile|BlackBerry|iPhone|iPod|Opera Mini|IEMobile/i)) {
		        html.className = "mobile";
		    } else if (agent.match(/Android|iPad/i)) {
		        html.className = "tablet";
		    } else if (agent.match(/MSIE 8/i)){
		        html.className = "ie8";
		    } else if (agent.match(/MSIE 9/i)){
		        html.className = "ie9";
		    } else if (agent.match(/MSIE 10/i)){
		        html.className = "ie10";
		    } else if (agent.match(/MSIE 11/i)){
		        html.className = "ie11";
		    } else if (current_width < 481) {
		        html.className = "mobile";
		    } else if (current_width < 739) {
		        html.className = "tablet";
		    } else {
		        html.className = "desktop";
		     }
		 }(); 	

	});
})(jQuery);