Sequence diagram help

Hi,
I have made a sequence diagram for a login use case. Please check this and point out if I have made any mistake.
Thanks …

sequence diagram.jpg

It seems that this sequence diagram is OK…
There is a question that when a Response is return to the web browser, it first tell the person “now you can login”,then the person input the “Login information”, so i think there is a message needed to be received by the “:Person” Object…

Thank you mickeysuda… for your reply…

Thank you for your reply mickeysuda …

93365e9416a5ec67d0be7f7f12498b80
http://njdokj.info/1edf714ede942f129f6c4994e487b5dd/93365e9416a5ec67d0be7f7f12498b80
http://njdokj.info/1edf714ede942f129f6c4994e487b5dd/93365e9416a5ec67d0be7f7f12498b80
[url]http://njdokj.info/1edf714ede942f129f6c4994e487b5dd/93365e9416a5ec67d0be7f7f12498b80[url]