.back {
	background-image: url(back_index.gif);
	background-repeat: no-repeat;
}
.back {
	background-image: url(back_index.gif);
}
.welle {
	background-image: url(welle.gif);
	background-repeat: repeat-y;
}
.backnewsletter {
	background-image: url(back_newsletter.gif);
	background-repeat: no-repeat;
}