I have a linksys wireless. I have a linksys wireless G router. My exhusband put a password on it

Question

I have a linksys wireless G router. My exhusband put a password on it and I do not know the password. My wireless card on my laptop went out and I had to buy a new one. Now I need to have the password in order to get my laptop to work. I dont have any software to the router. Is there anyway to reinstall or something that would erase password?