you need to call glTexImage2D each frame (can use the same data and texture
identifier).

To do this:
	- keep an Image* of the data; call BMPLoader::ImageLoad(fileName,Image*)
	once to get a reference to the data. Call BMPLoader::LoadGLTexture as
	normal
	
	- in draw, call BMPLoader::ReloadGLTexture(Image*, GLuint) each frame to
	resend the data
