How to allow multiple reactions with hit.gameObject.tag

function OnControllerColliderHit (hit: ControllerColliderHit) // collision of character with floor { I have attached the script to the character

A floor surface in the game has been tagged with " floor"

now the problem is whenever my character walks on the area tagged " floor" everything displays perfectly and all the functions work BUT whenever i walk back on the area tagged "floor" there is no display because the previous reaction has already acknowledged "display" as false . how do i get it to always display whenever i walk on it . is there some sort of enter and exit function to check when the character leaves the area tagged "floor" ? thank you in advance :) oh and i just wrote this without testing it but i'm sure it should work fine =]

private var display = false;

var Closed : boolean = true; // check id "close" button is pressed

Closed = false ;

if (hit.gameObject.tag == "floor") //

{

display = true;

}

function OnGUI () {

if ( Closed ) { display = false ;}

if (display) {

   GUI. Window (0, Rect (1,40,300,140),  "blad blad blah "); 
 
  Closed = GUI.Toggle (Rect (1,60,300,20), ""); 
 }
  

}