ExcelBanter - Control Website from Excel

I am trying to control a website from Excel VBA. It has page source
below:

<FORM class=chooser_form id=chooser_form name=chooser_form
onsubmit="return false;" action=http://www.example.com/ method=post
<INPUT type=hidden value=en name=lang
<DIV class=entry_url_out
<INPUT class=entry_url name=URL
</DIV
<DIV class=selector_site_2_out
<SELECT class=selector_site_2
onchange=change_info(document.chooser_form.site.se lectedIndex);
name=site
<OPTION value=Option1Option1</OPTION
<OPTION value=Option2Option2</OPTION
</SELECT
</DIV
<INPUT class=entry_submit onfocus=this.blur(); onclick=buttonDownload()
type=submit
</FORM

That website change a text into another text. Normaly under IE, we must
type on the input box in that website, and click the button.
Afterwards, that web show the result.
By this code below, I have succeed to enter a text in to the input box,
but I can't "click" in the button because that button didnt have a
name. Here is my code

Private Sub OpenWebPageAndInput_Click()
Dim objIE As Object
On Error GoTo error_handler
Set objIE = CreateObject("InternetExplorer.Application")
With objIE
.Navigate "www.example.htm"
Do While .Busy: DoEvents: Loop
Do While .readyState < 4: DoEvents: Loop
.Visible = True
With .Document.Forms("chooser_form")
.URL.Value = "test"
.submit '< this line was error

End With
End With
Set objIE = Nothing
Exit Sub
error_handler:
MsgBox ("Unexpected Error, I'm quitting.")
objIE.Quit
Set objIE = Nothing
End Sub

I have tried SendKeys "{ENTER}", True but it was fail too