Random exercise for children

My my my! I'm afraid I need a real coding expert for this!

I tryed to get a solution googling around but unsuccessfully.

Ok I try to explain.

See an example of the exercise at

http://drop.chardez.be

For those exercises I've 10 elements (.png) of legos.

What I want to do is get randomly two of the elements/per exercise with their math value (one.png: value 1, two.png: value 2 etc.) and code the right answer (< = or >) relatively to the values of the elements displayed.

I hope this will be clear enough.

Thanks!

DC