Fix several bugs in this class. Noticed by:	Henner Zeller <zeller@stud.fh-heilbronn.de>
Fix several bugs in this class.
Noticed by:	Henner Zeller <zeller@stud.fh-heilbronn.de>

kaffe/kaffe,kaffe/kaffe,kaffe/kaffe,kaffe/kaffe,kaffe/kaffe