One click TWO submits (IE7)

One click TWO submits (IE7)

Hi,

I have a problem with the following code:

<input name="next" value="next" id="nextBtn" onclick="document.form1.submit()" type="submit">

When clicking the link/button, IE(7) submits (POSTs) the form twice, the first time *without* the "next" paramater (the link itself) and then *with* the parameter.

Can anyone explain why this happens?

I think the problem will be solved by either removing the type=submit or the onclick-event, but it is not my code, so I'd like to get a better understanding of what's happening first...