// JavaScript Document

function showContents(id){
	document.getElementById('sub01_btn').style.display='none';
	document.getElementById('sub02_btn').style.display='none';
	document.getElementById('sub03_btn').style.display='none';
	document.getElementById('sub04_btn').style.display='none';
	document.getElementById('sub05_btn').style.display='none';
	document.getElementById(id+'_btn').style.display='block';
	document.getElementById('sub01_img').src = 'images/sub01.png';
	document.getElementById('sub02_img').src = 'images/sub02.png';
	document.getElementById('sub03_img').src = 'images/sub03.png';
	document.getElementById('sub04_img').src = 'images/sub04.png';
	document.getElementById('sub05_img').src = 'images/sub05.png';
	document.getElementById(id+'_img').src = 'images/'+id+'_on.png';
}