The official way to do this would be using the "accept" attribute:
accept = content-type-list [CI]
This attribute specifies a comma-separated list of content types that a
server processing this form will handle correctly. User agents may use this
information to filter out non-conforming files when prompting a user to
select files to be sent to the server (cf. the INPUT element when
type="file").

For example,
<INPUT TYPE=\"FILE\" NAME=\"UPLOAD_FOTO\" SIZE=\"40\" ACCEPT=\"image/jpeg\">

Unfortunately this is usually unreliably implemented in user agents, so you
should find a different solution as suggested by others.

Bogdan

Danielle van Gladbach wrote:

> How can I, using:
> <INPUT TYPE=\"FILE\" NAME=\"UPLOAD_FOTO\" SIZE=\"40\">
> specify the file extension.
> I want the user only to upload *.jpg.
>
> Thanks,
> Danielle
>
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