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jQuery(function($){
	$(window).on('load resize', function() {
		window_w = window.innerWidth;
		is_mobile = (window_w < 641) ? true : false;
		change_img();
	});
});

function change_img() {
	var $img   = $('.js-change-img');
	$img.each(function(){
		img_pc = $(this).attr('data-img-pc'),
		img_sp = $(this).attr('data-img-sp');
		if(is_mobile){
			$(this).attr('src', img_sp);
		} else {
			$(this).attr('src', img_pc);
		}
	});
}