// JavaScript Document

//スクロールサブメニュー

var timer

window.onload = scrolltop;
window.onunload = stoptimer;

function scrolltop() {
  var menu = document.getElementById('submenu');
  var scrollTop = document.body.scrollTop || document.documentElement.scrollTop;
  if (scrollTop > 237) {
	  menu.style.top = 0 + scrollTop;
  }
  else {
	  menu.style.top = 237;
  }
  timer = setTimeout("scrolltop()",10);
}
function stoptimer() {
  clearTimeout(timer)
}