Half way there with Filemaker to the webb

I am implementing a AppleScript in my FileMaker Pro 9 to automate som tasks from FM to the web. I have the code half working:

  1. I don’t know where or what field name I should put the value in, in the form on the webb page? Here is the HTML code for that field where the value should go in:
  1. To then hit “Return” don’t work for some reason so I have to manually click. Is there a way around that? Here is the “Search” button HTML

And my last problem is that every time I hit the button in FM a new window is opening, and then I would have hundreds of new windows. I need the same window to be used all the time.

I truly hope I can get some help here or directions where to ask. I did try the Apple discussion, and this is as far as we got

Browser: Safari 419.3
Operating System: Mac OS X (10.4)