Problem loading scene on

I am trying to get button to load new scene when clicked but when I click anywhere it happens
Here is my code:

 #pragmastrict
 
 functionUpdate () {
 
 if(Input.GetMouseButton(0))
 
 Application.LoadLevel("TEST");

}

Please help

function OnGUI(){
if(GUI.Button(new Rect(50, 50, 200, 40), “load new level”){
Application.LoadLevel(“TEST”);
}
}