emai and http links in OpenOffice Calc

[R.L.Reingard]

hello
i do have some email and http links in a calc list. they get opened either  
by thunderbird and mozilla firefox, programs which i do not use. i  
searched for those settings under 'options' in OpenOffice Calc but do not  
find them.
who knows where to make changes to the default email and web program for  
OpenOffice (Calc)?
(i already changed the default settings in Gnome so that the programs get  
opened which i use for email and web, and it works fine fot that.)
thank you for an answer,
René