function know(){
	document.getElementById("content1").style.display="none";
	document.getElementById("content2").style.display="block";
}
function unknow(){
	document.getElementById("content1").style.display="block";
	document.getElementById("content2").style.display="block";
}
function manga1(){
	document.getElementById("manga").src="imgs/trybank_touroku-manga1.gif";
	document.getElementById("mlink1").style.color="#333";
	document.getElementById("mlink2").style.color="#207FDD";
	document.getElementById("mlink3").style.color="#207FDD";
}
function manga2(){
	document.getElementById("manga").src="imgs/trybank_touroku-manga2.gif";
	document.getElementById("mlink1").style.color="#207FDD";
	document.getElementById("mlink2").style.color="#333";
	document.getElementById("mlink3").style.color="#207FDD";
}
function manga3(){
	document.getElementById("manga").src="imgs/trybank_touroku-manga3.gif";
	document.getElementById("mlink1").style.color="#207FDD";
	document.getElementById("mlink2").style.color="#207FDD";
	document.getElementById("mlink3").style.color="#333";
}