onload = function (){ 
	var bodyHeight;
	if (self.innerHeight) {
		bodyHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) {
		bodyHeight = document.documentElement.clientHeight;
	} else if (document.body) {
		bodyHeight = document.body.clientHeight;
	}
	document.getElementById('menu').style.height= bodyHeight+"px"; 
}