How do I some changes

Hello Com,

I have a few question, but first of all, thank you for reading this.

1. I have entered an tresor chest system, that means that Players can buy a Tresor Chest. In the Tresor Chest, should be Items like Weapons... Sooo now I have created 3 Weapons now I want that the user gets one weapon when he bought the chest RANDOMLY but with % chances, that means for example:

Weapon 1 = Drop Chance 50%

Weapon 2 = Drop Chance 40%

Weapon 3 = Drop Chance 10%

That means Weapon three is rarer than the others because it is not so easy to get this one, how can I create this system??

2. Is it possible that I can create glitter arround the weapons.. That the weapons are Shiny or glitter particles or something else, that looks cool and makes this weapons rarer..

Thanks

I have an example of random items on the scirra arcade:

with only 3 weapons..is quite simply..

choose(W1,W1,W1,W1,W1,W2,W2,W2,W2,W3)