I'm not going to write the code but you could use one or more <DIV> elements to display your list, with UP and DOWN buttons after every element (perhaps better would be a 3 column table?). Each up and down button would swap the relevant entries and update the page and the hidden field with the new order. You will then have submit button to send the final order to your CGI script.
Note that IE has problems with submiting dynamically generated forms so the parts of the form that need to be sent at the end should be parts that existed onthe original page!
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