lynx-dev -post_data

[Matt Staley]

How the heck do I use -post_data?   if the web site has like this,
<FORM NAME="lookup_form" METHOD="POST" ACTION="/cgi-bin/zip_agent" 
  onSubmit="return ValidateLookupForm()">
...blah blah
<input type=text name="city" size=24>
...blah blah
<input type=text name="state" size=2>
...blah blah
<input type=text name="zip" size=2>
...blah blah
</form>

If i just want to type one command to pass a value like 21777 to zip and
ignore the rest...how do i do it?

i tried like:
lynx -auth=joe:somepwd -post_data http://www.somewebsite.com/lookup.html <
test


and test file content is:
zip=21777
----

What am i doing wrong?

Matt