How to login from other website into current wordpress site

Hi,

I want’t to make all registered users of my site (www.goo2o.com) to be able to login to my new wordpress blog site with there same account details. So, it means whenever any user from my site (www.goo2o.com) come to my wordpress blog site make login then wordpress make it logged in user.

Please help me how can I implement this, so that my registered users of other site(not a wordpress site) would be able to loggin my wordpress site without submit a registration form.

Thx