IE.au3 Problem with click on the input

Hi. I don`t know how click in this input.

<input type="submit" value="submit1">

I must click in this input because form have got javascript, which start after click. When I click appears popup window where I must confirm my choose.

When I use FF.au3 and function

_FFFormSubmit("Form","id","click")

submit works.
In _IEFormSubmit i can`t set "click".