How to ad a ' vhost' to proftp

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Can someone tell me how I can ad an ftp user thats lockt in a directory like
/opt/lampp/htdocs/spot

So he can not go back to the htdocs dit and download al the files....

Please help me

I saw that there is a script for this but I cant find it any more on www.pc-dummy.net
:S

Tnx for helping me out

Greets,

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