IE form checkbox problem

[weirddave]

I'm trying to tick the "remember me" checkbox on a site I want to log into (facebook as it happens).

I can click it using:

$oQuery = _IEFormElementGetObjByName($oForm, "persistent")

_IEAction($oQuery, "click")

But this toggles it every time the script is run

What I'd like to do is:

_IEFormElementCheckBoxSelect ($oForm, "persistent", "" , 1, "byValue")

But it doesn't work, however this does:

_IEFormElementCheckBoxSelect ($oForm, 0, "" , 1, "byIndex")

I just don't understand why the other doesn't work.

Here's the html for the checkbox:

<input type="checkbox" name="persistent" value="1" />

Can someone shed light on why I can't call it by name?