jquery help

[bioshock]

hello

i am new to jquery . i have a contact from in the website on right side when a user submits from a message box should pop up for successful submission. but its not showing up although the submission is working i mean i get the mail

here is the website the right side contact box http://tinyurl.com/24ronmv

its sends data to from.php returns json encoded data like [true,"Great!"]

please help

thanks