http://www.facebook.com/contact.form
How to add a contact form to your facebook fan page
1-go to facebook
a-Search contact form
b-Like the page
4-Go to application and set up the form
a-Choose the fan page to set up
b-Fullfill the form with your information.
c-Picture and message text for users who wish to contact you.
d-Select the fields you want to display on your form.
5-Add the tab on your page
a-Check it s ok
b-Thx Label-Internet