How do I use form data sent to the server using jquery formwizard plugin

How do I use form data sent to the server using jquery formwizard plugin

Hi guys,

I found this formwizard script example online but I don't know how to use the data with php
for emailing and saving to database for example. 
The script attaches the result to <p id="data"></p> like this

firstname=&surname=&day=DD&month=MM&year=YYYY&lastFour=XXXX&countryPrefix=+358&areaCode=&phoneNumber=&email=jasonhoefie@hotmail.com&username=&password=&retypePassword=

I attatched the source in this post. Please help. Thx..