function wechseln(spr) {
	var file = document.location.href.substr(document.location.href.lastIndexOf('/') + 1,document.location.href.length);
	var slug = (file.indexOf('_') != -1)?file.substr(0,file.lastIndexOf('_')):'startseite';
	document.location.href = slug + '_' + spr + '.html';
	return false;
	}