Alpha Channel in Photoshop for iWeb instant Alpha?

Hi,
Recently i wish to Make a Picture's Background to transperence.
I try to use a ODD color (green screen's GREEN) as background color so that it'll be easy to delete the background when apply the instant alpha function...but i relize that it doesn't really make sense at all...Most of the parts doesn't process well...
Question:~
+ What s'ld i do in Photoshop before i bring the picture file into iWeb for instant alpha?Alpha Channel and save as .psd?
+ Do any other useful way to solve the issue above?
Thanks!!

Here's what I do:
1 - open the file, double click on the background layer in the Layer pane to unlock it and add a second layer below the original layer.
2 - using your tool of choice delete the background you want removed. If the background is a single color I use the Magic Wand tool. You may have to work with the Tolerence number if there's any gradiants. Other wise I use the Quick Selection tool (again you may have to set the Tolerence level)
3 - When he background is removed you then use the File->Save for Web and Devices option.
4 - in the next window select PNG8 under Preset and check the Transparency box. Colors is set to 256, Dither at 200% and Web Snap 0% (these are all the defaults the first time I used it).
5 - The background should show transparent. It it doesn't click on the color that you want transparent in the Color Table and then click on the far left box in the toolbar directly below the color chart. You can add additional colors if desired.
6 - Save and you're done.
OT

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