renderer.material.color = Color.black; var isQuitButton = false; var isPlay = false; var isLoad = false;

function OnMouseEnter() {

//Change the color of the text

renderer.material.color = Color.green;

//PlayAudio
GetComponent(AudioSource).enabled = true;

}

function OnMouseExit() {

//Change the color of the text back

renderer.material.color = Color.black;

//KillAudio
GetComponent(AudioSource).enabled = false;

}

function OnMouseUp() {
if( isQuitButton ) {

    //quit the game
    Application.Quit();

}
else
    if( isPlay )
{

    //load level
    Application.LoadLevel(1);

}
        if( isLoad )
{

    //load level
    Application.LoadLevel(0);

}

}

heres the script i use for exactly that'... attach to a 3dtext or whatever just make sure it has a box collider on it

Check out this video tutorial

Hope this helps!