how i can Roll a dice??

hi all

i have to roll dice in a game…

here is script i have written to roll dice…

var prefab: GameObject;
var obj;


function Update () {
if (Input.GetButtonDown("Fire1"))
{
    //Destroy (obj);
	obj=Instantiate(prefab, Vector3(Random.Range(0,0),50,Random.Range(0,0)), Random.rotation);
	Physics.gravity = Vector3(0, -20.0, 0);
	}	
}

Please any one tell me how i can determine what is on dice??
Please help me… i am stuck in it…

Have a look here. It might help.

Thanks for both…

I have done it Philipp,s solution…