function changeDivImage() {
	document.getElementById("box").style.backgroundImage = "url(img/navi_babybett.jpg)";
	document.getElementById("github99a").style.display = "none";
	document.getElementById("github88a").style.display = "block";
	document.getElementById("kleinkind").src="img/navi_buttonrechts.jpg";
    document.getElementById("saeuglinge").src="img/navi_buttonlinks.jpg";
} 
function changeDivImage2() {
	document.getElementById("box").style.backgroundImage = "url(img/navi_babybett2.jpg)";
	document.getElementById("github88a").style.display = "none";
	document.getElementById("github99a").style.display = "block";
    document.getElementById("kleinkind").src="img/navi_buttonrechts2.jpg";
    document.getElementById("saeuglinge").src="img/navi_buttonlinks2.jpg";
}