[HORRIBLE]

Можно так:

Код:

#include <IE.au3>
$oIE = _IECreate("http://www.bankrollmob.com/signup.asp")
$oForm = _IEFormGetCollection ($oIE, 1)
$first_name = _IEFormElementGetCollection ($oForm, 0)
$last_name = _IEFormElementGetCollection ($oForm, 1)
$Email = _IEFormElementGetCollection ($oForm, 2)
$Email2 = _IEFormElementGetCollection ($oForm, 3)
$captchacode = _IEFormElementGetCollection ($oForm, 4)
$Submit_Bottom = _IEFormElementGetCollection ($oForm, 5)

_IEFormElementSetValue ($first_name, "$first_name")
_IEFormElementSetValue ($last_name, "$last_name")
_IEFormElementSetValue ($Email, "$Email")
_IEFormElementSetValue ($Email2, "$Email2")
$value = InputBox("captchacode", "Enter code")
_IEFormElementSetValue ($captchacode, $value)

_IEAction ($Submit_Bottom, "click")