I'm not really sure what you're trying to accomplish. Regarding the GET url you're trying to send to your iframe, that's the whole point of the form... ie
...replacing your inputs with checkboxes or radio buttons or whatever else is appropriate. Then when the click submit the end user's GET requests gets sent directly from their PC to the destination url (ie, paginas.imoguia.pt). That page then opens in the iframe.
<form action='http://paginas.imoguia.pt/constantinogomes/kitservidor/en/listagem.htm' target='test'>
What are you trying to do? Just give easy access to the page or are you trying to do something with?