title: How to scrape website with search button
body: <p>I have this website: <a href="http://comext.aduana.cl:7001/codigos/" rel="nofollow noreferrer">codigos</a> if You look at it, it has a selection field at left, and a go button at right, I need to scrape some of the items on left.</p>
  
  <p>But, how can I tell to mechanize in ruby how to access that selection field and then make the search and scrape it?</p>
  
  <p>I've seen examples with login forms but I don't know if it can really suit this case though.</p>