function eml(empf) {
	switch(empf) {
	 case "pph":
	 	empf = "Prof.Hollfelder@t-online.de";
	 break; 
	 case "fn":
	 	empf = "florian.noetzel@t-online.de";
	 break;
	}
	location.href = 'mailto:' + empf;
}