window.onresize = restoreLayout;

function restoreLayout(){
	if(window.innerHeight){
		var yav = window.innerHeight;
	} else if (document.body && document.body.offsetHeight) {
		var yav = document.body.offsetHeight;
	}
	var mainmenuV = yav-184;
	var inhaltV = yav-184-85;
	document.getElementById("mainmenu").style.height = mainmenuV + "px"; 
	document.getElementById("inhalt").style.height = inhaltV + "px"; 
}