more workgroups at local accounts

Hi people
I use my laptop at home and also in my work. But I have got a problem with diference in workgroups. In work we use workgroup A and at home I use workgroup B. I also use two accounts. One in work and second at home.

I need to set up one workgroup in home account and another workgroup in work account.

I use win 7 proffesional. But in both networks are computers with XP and Vista.

Thanks for your time.
Honza

Really nobody know how to solve this problem?