Input.GetMouseButtonDown no working

Questions & Answers
1

i have a get mouse button down script for an sprite for when i click the 2d sprite a level loads. I though it worked but it turns out everywhere i click i load the scene. How do i make it so when i click on the sprite on its own a scene loads.

    function Update () {
         if(Input.GetMouseButtonDown(0))
             Application.LoadLevel("1");
     }
2

Input.GetMouseButtonDown(0) works just how it should be.

I would recommend you to watch this tutorial https://unity3d.com/learn/tutorials/modules/beginner/ui/ui-button