// JavaScript Document
function b2Over(){
	document.getElementById('b2menu').style.display='block';
	document.getElementById('sb2').style.visibility='hidden';
	document.getElementById('sb3').style.visibility='hidden';
}
function b2Release(){
	document.getElementById('b2menu').style.display='none';
	document.getElementById('sb2').style.visibility='visible';
	document.getElementById('sb3').style.visibility='visible';
}

function b3Over(){
	document.getElementById('b3menu').style.display='block';
	document.getElementById('sb3').style.visibility='hidden';
	document.getElementById('sb4').style.visibility='hidden';
	document.getElementById('sb5').style.visibility='hidden';
}
function b3Release(){
	document.getElementById('b3menu').style.display='none';
	document.getElementById('sb3').style.visibility='visible';
	document.getElementById('sb4').style.visibility='visible';
	document.getElementById('sb5').style.visibility='visible';
}