https://www.o-seven.co.jp/skins/tachibana/js/loadingmark.js

1$(function(){
2	  var html = document.getElementsByTagName('html')||[];
3	  html[0].classList.add('enable-javascript');
4		$('#loader-bg ,#loader').css('display','block');
5		$(".top-title,.bottom-title,.menu").css('display','none');
6	  window.addEventListener("load", function(){
7	    html[0].classList.add('window-load');
8			 $('#loader-bg').fadeOut(800);
9	 		 $('#loader').fadeOut(300);
10			$(".top-title,.bottom-title,.menu").css('display','block');
11	  }, false);
12
13
14	    setTimeout(function(){
15			$(".top-title,.bottom-title,.menu").css('display','block');
16	        $(".top-title,.bottom-title,.menu").stop().animate({opacity:'1'},1000);
17			 $('#loader-bg').fadeOut(800);
18	 		 $('#loader').fadeOut(300);
19	    },5000);
20
21});