>Not sure what you are referring to here - a simple input control of type text should not trigger a submit whether auto-fill is enabled or not.
>Can you show the html for the relevant control ?

The reason is does is because I put onkeypress at the textbox level. The problem is that those browser supporting the auto complete provides a dropdown list on top of it and pressing Enter on that one does as if the Enter key would have been pressed at the textbox level. IMHO, it should not. The goal here is to be able to detect that.