nav:not(.mm-menu)
{
	display: none;
}

.header a
{
	background: center center no-repeat transparent;
	background-image: url( Bilder/navi_mobil.jpg);

	display: block;
	width: 50px;
	height: 42px;
	position: absolute;
	top: 0;
	left: 10px;
}
#mm-menu {background:#666666;z-index:999;}

#mm-menu li {text-align:left;}