The -onChange parameter only sets up the drop-down to call a JavaScript method, it doesn't write the method for you. You will want -onChange=>'mySubmit()' as a parameter, and have the CGI emit a JavaScript at the beginning of the document. Assuming that you assign name="theForm" in the form tag, the JavaScript might be something like:

function mySubmit() {
   document.theForm.submit()
}
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