texture animation during level load

I would like to have a loading screen with a simple animation on a GuiObject while the player is waiting for the next level to load.

I have a screen that runs fine on its own, but as soon as I tell Unity to load a scene, the whole app freezes while it waits until the scene is loaded. Are there any routines I can use to run a texture animation and have it update to the screen during a scene load?

thanks,
-rob