Coding appear erro

HI,

This is my website http://prforaustralia.com/en/

dont know why, all the code appear at the bottom of the website itself.

This theme was designed by my friend, but he also no idea what is this appear like this after a month we successful implement this theme.

Anyone any idea how to solve?

THanks in advance

Regards,
Wei Hong