function email(name, domain, tld, link, betreff) {
	if (link.length == 0) {
		link = name + '@' + domain + '.' + tld;
	}
	if (betreff.length > 0)  {
		betreff = "?SUBJECT=" + betreff;
	}
	var display_this = '<a href="mailto:' + name + '@' + domain + '.' + tld + betreff +'">' + '<span class="normal">' + link + '</span>' + '</a>';
	document.write(display_this);
}