(function() {
	this.isMobile = function(breakpoint, option) {
		return window.innerWidth < breakpoint;
	};
	this.switchImages = function(breakpoint, option) {
		// Variable
		var selector = 'img[src$="_pc.png"], img[src$="_pc.jpg"], img[src$="pc.jpeg"], img[src$="pc.gif"], img[src$="pc.tiff"], img[src$="_sp.png"], img[src$="_sp.jpg"], img[src$="sp.jpeg"], img[src$="sp.gif"], img[src$="sp.tiff"]',
				flag = '';

		// Function
		function onResize() {
			if (window.innerWidth < breakpoint && (flag === 'pc' || flag === '')) {
				flag = 'sp';
				$(selector).each(function() {
					var imgPath = $(this).attr('src').replace(/_pc\.(.*)$/, '_sp.$1');
					$(this).attr('src', imgPath);
				});
			}
			else if (window.innerWidth >= breakpoint && flag === 'sp' || flag === '') {
				flag = 'pc';
				$(selector).each(function() {
					var imgPath = $(this).attr('src').replace(/_sp\.(.*)$/, '_pc.$1');

					$(this).attr('src', imgPath);
				});
			}
		}

		// do something
		(function() {
			onResize();
			$(window).on('resize', function() {
				onResize();
			});
		})();
	};
}).call(this);