Are Diodes Necessary in a H bridge circuit for motor braking?

Hie i am trying to build a mosfet motor driver using the schematic shown below. Do i need protection diodes for motor braking as indicated by those red squares and are they facing the right way? Thank you.

I will be using 80A  N channel mosfets. I have my interest in this one:

http://au.element14.com/nxp/psmn4r3-30pl/mosfet-n-ch-30v-100a-to-220ab/dp/1845641


The website i sourced this schematic is:
http://tahmidmc.blogspot.sg/2013/01/using-high-low-side-driver-ir2110-with.html

 

Thank you.