How do i switch scenes in game?

I need to switch the scene/level in game by clicking on a button.
I have the button highlighting in blue when you hover over the “hitbox” which is a box collider.
When i click on the button nothing happpens and the game stays at the menu. How do I fix this so it goes to the scene?
Here is the script (javascript):

function OnMouseEnter()
{
	renderer.material.color = Color.blue;
}

function OnMouseExit()
{
	renderer.material.color = Color.white;
}

function OnMouseClick()
{
	Application.LoadLevel ("InGame");
}

All scenes should be included in File => Build settings => Scenes in build. (it would work if that was the same scene you’re currently in, though for build you would need to include it anyway)

Also make sure that actual name of that scene is equal to “InGame”. (just in case)

P.S. Also to test out if your function is actually triggered, you could do this:

 function OnMouseClick()
 {
     Debug.Log("Works!");//Works! should appear in console log
     Application.LoadLevel ("InGame");
 }