function changeTab(hoge){
	for(num=1;num<3;num++){
		document.getElementById("tab"+num).style.display = "none";
}
	document.getElementById(hoge).style.display = "block";

}

function changeSideTab(hoge){
	for(num=1;num<3;num++){
		document.getElementById("sidetab"+num).style.display = "none";
}
	document.getElementById(hoge).style.display = "block";

}

function changeTab2(hoge){
	for(num=1;num<7;num++){
		document.getElementById("tab"+num).style.display = "none";
}
	document.getElementById(hoge).style.display = "block";

}