rss feed: producing full (not relative) urls

> in generating the urls for enclosures, pier currently outputs:
>
> <enclosure url="/?_s=hKOzAr2x1GB6Y5GS" length="8740698" type="audio/mp3"/>
>
> i would like it to be:
>
> <enclosure url="http://www.ThoseOptimizeGuys.com/?_s=hKOzAr2x1GB6Y5GS"
> length="8740698" type="audio/mp3"/>
>
> the code that generates it is:
>
>        (enclosure := aPost enclosure) isNil ifFalse: [
>                rss enclosure
>                        url: enclosure file url;
>                        length: enclosure file filesize;
>                        type: enclosure file mimetype ].
>
> how would i go about generating the fully qualified url?
>
> thanks!
>
>
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> ----
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> sergio
> photographer, journalist, visionary
>
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