.classname .href help

hi

I'm looking for more information on the decimal value? i see this used a lot and it's not really explained anywhere yet it seems kind of important as my code wont run without it...

for instance the below example

While 1
    $meyes = _IETagNameGetCollection($meme, "input")
    For $input in $meyes
        if $input.className == "mll user_action yes green_btn_big btn btn-large btn-success greenBtnBig" Then
            Sleep(300)
            _IEAction($input, "click")
        EndIf
    Next
    Sleep(300)
WEnd

$input.classname... now say i was to get the objectbyid would I replace tagname with _IEgetobjbyid... For $whatever in $whatever if $variable.id ==

or by the link would i put $variable.hrefName or just $variable.href ==

just wondering because im trying to get a rollover nav bar that doesnt seem to have input so i have to use another method

is there any more information on this or can someone explain it to me