Open web page in access

Question

Hi,

I am new to access and vb, and would really appreciate a bit of help.

I have a button in my access database, when clicked it opens a web page, this works fine.
here is my code.
Private Sub Command268_Click()
Shell "explorer.exe http://www.bing.com/maps/"
End Sub
My question is how can I pass the addess to open the map at the location if I have 3 separate fields.
Address
city
post

Thank's