Dont be discouraged by at first sight complicated steps. You will be doing it just once per website (one Megamenu)
If you have questions just name number of step.
I tried many, many ways to call PHP...
Using Themler with Vrtuemart and Joomla
How do I set up a multi column menu?
If you do not which to implement the prediction?
It will be very good, if I have to put the image of a featured product in...