Hi there, I need help with a discount code/promo text area.

On a page I have an input text box called "promo"

I want the user to enter a code and this will then give the user a discount on their order.

For now I jsut want to check whether the code matches the stored code.

This will all be client side. I imagine the code will have to encrypted/decrpted.

so the journey is:

user puts in code : hello

the javscript takes 'hello' and checks it agains the stored discount code which is goodbye.

as they do not match a msg appears saying sorry incoreect promo code.

IF the user enters goodbye as their promo code the JS knows is is correct and displays a msg saying thank you promo code correct.

What is the best way fo going about this?