Analogue OnMouseUp for iOS(Unity iPhone)

Hello. I have a question. When I work in Unity Mac, I use the script:

var isBtn = false;

function OnMouseUp() { if(isBtn) { Application.LoadLevel(1); } }

But this script does not work on iOS. I tried using:

function Update() { var count = Input.touchCount; for (var i: int = 0; i < count; i++) { var touch : Touch = Input.GetTouch(i); Application.LoadLevel(1);

      } }

But it starts Application.LoadLevel (1) when you click on any part of the screen.

Tell me please how to convert my Mac script to make it work in iOS.