movie maker moving background

[rick hart]

re windows movie maker using XP; I'm trying to find a moving background - something like a Media Payer visualisation - that I can add to the background of a Movie Maker project. In particular it needs to "stretch" so I can add or remove slides over the top of it.
Does anyone have ideas of (a) what format it should be in; and (b) whether downloadable anywhere? - free if possible
Thanks

[Satyrs]

Following few file format can be used as a background as they are few file format for moving images. you can also include .GIF picture file format for the same along with these few file formats.

• AAF
• AC-3
• ASF
• AVI
• AVI, AVI (Audio Video Interleaved)
• AVI_Cinepak, AVI, Cinepak Codec
• AVI_DivX, AVI, DivX Codec
• AVI_Indeo, AVI, Indeo Codec
• AVI_MJPEG, AVI, MJPEG Codec
• Cinepak
• Cinepak, Cinepak Video Codec
• DCI (Digital Cinema Initiative)
• DCDM_1_0, Digital Cinema Initiative Distribution Master (DCDM), Version 1.0
• DCP_1_0, Digital Cinema Initiative Package (DCP), Version 1.0
• DivX
• DPX
• DTS
• DV
• DV
• Flash (SWF, FLA, FLV)
• Indeo
• JPEG 2000 Encodings
• MJP2
• MPEG-1
• AAC_MP4, Advanced Audio Coding, MPEG-4