// JavaScript Document

function myheight() {
	
var contentH = document.getElementById('content').scrollHeight;
// alert(contentH);
	if (contentH > 400) {
		document.getElementById('navi').style.height = contentH + 'px';
		document.getElementById('subnavi').style.height = contentH + 'px';
		document.getElementById('foot').style.marginTop = contentH - 400 + 'px';
	}
}