Using a GUI Movie Texture (making it appear and disappear correctly)

Hi, I'm trying to make an application which is very focused on the use of the videos. For example when the user reaches a specific place or clicks a button the specific movie will play in full screen. The way i was trying to get around this was by making the movie texture as part of the GUI, but i have problems with this in that i can get it to appear "All" the time, or not at all, i cant seem to get it working properly for after the button is pressed the movie will appear and then disappear when finished (once i get it working this is the plan)

Snippet of code (probably of no use, just say if you need any more info) to try get the idea across.

var movie : MovieTexture;
var buttSun : Texture;
var buttStop : Texture;

function OnGUI()
{

    GUI.DrawTexture(new Rect(0, 0, Screen.width, Screen.height), movie, ScaleMode.StretchToFill, false, 0.0f);

    if (movie.isPlaying == false && GUI.Button (Rect (1000, 25, 40, 40), buttSun))
    {
        movie.Play();
    }
    if (movie.isPlaying == true && GUI.Button (Rect (1000, 25, 40, 40), buttStop))
    {
        movie.Stop();
    }

could you put the seperate movies on seperate cameras that are turned off by default, then when you press the button it turns off the camera that the player is normally using and then turn on the relevant camera? We have something like this for our "death Cam", when a player dies he switches off his camera and switches on the death cam and can see the rest of the scene.

Are you sure your logic is correct?

The following works fine for me:

if (movie && movie.isPlaying)
{
  GUI.DrawTexture(new Rect(0, 0, Screen.width, Screen.height), movie, ScaleMode.StretchToFill, false, 0.0f);
}

It's easy to fade the MovieTexture object in and out by setting GUI.color also.

It'll be nicer once the additional (and much needed!) movie playback functionality is in place of course, such as seeking and current position.