function set_content(url) {
	document.getElementById('maincontentdiv').innerHTML = url;
	document.getElementById('maincontentdiv').style.backgroundColor = "#FFFFFF";
}
var i = 0;

function change_bg() {
	if(i == 0) {
		document.getElementById('maincontent').style.backgroundImage = 'url(images/homeimg/1627.jpg)';
	}
	if(i == 1) {
		document.getElementById('maincontent').style.backgroundImage = 'url(images/homeimg/1671.jpg)';
	}
	if(i == 2) {
		document.getElementById('maincontent').style.backgroundImage = 'url(images/homeimg/1678.jpg)';
	}
		if(i == 3) {
		//Raus 1701.jpg
		document.getElementById('maincontent').style.backgroundImage = 'url(images/homeimg/1627.jpg)';
	}
	i++;
	if(i >=4) {
		i=0;
	}
}