Why Wont my Scene Switch?

I am making a game with a start menu but every time I click the play button it says it couldn’t find my scene. I already put it in the build settings. Here are some scripts I have already tried:

function OnMouseDown () {
Application.LoadLevel(“Levelk35tjh”);
}

also this one:

function OnMouseDown () {

Application.LoadLevel("Level1");
}

and these

function OnMouseDown () {

Application.LoadLevel("k35tjh");
}

,

function OnMouseDown () {

Application.LoadLevel("1");
}

Please help, thanks in advanced

I have the scene number as a variable (just the number corresponding to the loaded scene in the build settings), this works fine:

using UnityEngine;
using System.Collections;

public class LoadOnClick : MonoBehaviour {

public void LoadScene(int level){

Application.LoadLevel (level);

}

You sure those scenes are in your build?