recursive transparency (windows commandline)

[RAB74]

Dear list,

I am a brand new ImageMagick user (working in Windows 7) so forgive my ignorance but I would like to recurse this command to convert the background of a png to transparent, overwriting the original files (rather than copying to a new folder)

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FOR %G IN (*.png) DO convert %G -transparent white test \%G

By following the thread here viewtopic.php?f=1&t=14112&start=15 and example here
I put together this command

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FOR /R %%a IN (*.png) DO convert -transparent white "%%~a" "%%~dpna.png

getting this error

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%%a was unexpected at this time.

Altering to:

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for /R %i IN (*.png) DO convert -transparent white "%i" "%%~dpna.png"

(based on another batch script I have) runs but does not overwrite the output to the original files instead to a png named %~dpna in the top folder
If anyone has a moment to help me tweak the code I would really appreciate the advice!

Thanks for reading
Rebecca

[snibgo]

If you are typing at the command line, don't double percent characters.

If you are running BAT files, do double percent characters.

Your last command sets up variable %i but uses both %i and %a.