Fading images into each other?

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I would like to create a banner which consists of a selection of images fading into each other.

How would I go about doing this?

Would I need Macromedia Flash, or is there a free program out there what can do it?

Also what is the best format to save as, to place it on a website?

Cheers for any help.

 

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Cheers, will check that out.

Tried doing it in Windows Movie Maker and kind of got the results - only a huge file size/wrong resolution. Also it seemed to darken the pics?

Anyways, will give SwishMAX a go.

Thanks.

 

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I'm getting worried, i'm finding it hard!

No matter where I add an image, the switchover time is always 1 second!