2D GUI help

So I am a complete beginner at everything. I decided for some Extra credit in Spanish to make a 2D Platformer and I want it so when you hit a "Spike" some text apears that says, "Pick A Card!" As well as teleporting the player to the begining. I am using Javascript for the code.
code :

#pragma strict


function OnTriggerEnter(other:Collider) {
if (other.tag == "Player") {
function OnGUI () {
GUI.Label (Rect (10, 10, 100, 20), "Pick A Card!");
}
Player.Vector3 = Vector3.new("Begining here")
}
}

 

What happens is the Pick A Card is always there in the top left of the screen or I get an error with the OnGui function.