; This example opens the AutoIt forum search page and toggles the sortby radiobuttons. 
; An identical technique can be used with checkboxes.

#include <IE.au3>

$oIE = _IECreate()
_IENavigate($oIE, "http://www.autoitscript.com/forum/index.php?act=Search&f=")

$oFrom = _IEFormGetObjByName($oIE, "sForm")
$oRelevant = _IEFormElementGetObjByName($oFrom, "sortby", 0)
$oRecent = _IEFormElementGetObjByName($oFrom, "sortby", 1)

For $i = 1 to 5
    $oRelevant.checked = True
    Sleep(1000)
    $oRecent.checked = True
    Sleep(1000)
Next