calculate window width

// var height = (window.innerHeight > 0) ? window.innerHeight : screen.height;
// var width = (window.innerWidth > 0) ? window.innerWidth : screen.width;

$(function() {
	$(window).on('load resize orientationchange', function() {
		var width = (window.innerWidth > 0) ? window.innerWidth : screen.width;
	  if ( width <= 777 && width > 480 ) {
		  // do smthng
		} else if ( width <= 480 ) {
		  // do smthng
		}
	});
});