function setGround() {
	var groundheight = $('#root').height();
	if (groundheight > 0) {
		var groundElement = $('#main');
		var submenueElement = $('#submenue');
		groundheight += 20;
		groundElement.height(groundheight);
		var submenueheight = $('#mitte').height;
		submenueElement.height(submenueheight);

	}
}