function button(n){
	document.getElementById('menunavi'+n).style.color="#FC9900";
	document.getElementById('menunavi'+n).style.background="url(./image/navi/navi_bg.gif) no-repeat";
	document.getElementById('sub'+n).style.display="block";
	for (i=1; i<=6; i++) {
    if (i == n) {continue;}
	document.getElementById('menunavi'+i).style.color="#968574";
	document.getElementById('menunavi'+i).style.background="none";
	document.getElementById('sub'+i).style.display="none";
	}
	}