function portfolio() {
	var wHeight = 380, wWidth = 760;
	var posx = (screen.width/2) - (wWidth/2);
	var posy = (screen.height/2) - (wHeight/2) - 25;
	if(posx < 0) { posx = 0; }
	if(posy < 0) { posy = 0; }

	window.open('portfolio_neu.html', 'mainWin', 'resize=no,scrollbars=yes,status=no,menubars=no,toolbar=no,width='+wWidth+',height='+wHeight+',left='+posx+',top='+posy);
}

function email(user, domain, tld) {
	location = 'mailto:' + /* Benutzer: */ user + '@' + /* Domain */ domain + '.' + /* TLD */ tld;
}