upload multiple files using HTML form and JSP or CGI or ASP

How can I upload multiple files using HTML form and some other mean?
I know how to use the regular form (<input type=file...) but do not want to put many browse buttons and do not how many files the user will upload at one time.

Some thing similar to hotmail attachment.

any idea?

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hotmail's attachment is simple file attachment interface. it upload file once a time and store uploaded files under user's session, you can do the samething if you'd like. just upload one file a time and store it in memory or a temp dir, then keep the list in session. display the <input type=file> again with a list of file that has already been uploaded. when user select a file and click remove, just remove the file from memory or temp dir.

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Have a look at smartUpload at http://www.jspsmart.com/
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