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i think i understand what ur wanting, however i can't tell you how to..
but i do understand that there is a hell of a lot of confusion of what an avatar actually is..
avatars and photo's are completely different.. i had this on myold site, using x-ipbm module which has avatar uploads and also allows a personal photo on the profile page..
an avatar is just that.. a picture for the usewr to use in forums etc.. and really shouldn't be used for posting personal photo's of oneself.. i had to keep telling my members that.. (i really wouldn't want my forums full of photo's of highish quality and filesizes as it would dramatically increase page loading times).
So i think a better route to take, would be to suggest a new feature for the next version of xoops, ie.. can we have a personal photo facility for users profiles.. and that photo only appear on the profile or wherever.. and that would then keep avatars for their proper usage..