How to select a select box without a form?

[latogt]

Hi,

the subject is also my question: Is there any way to select a option of a select box without having this box in a form?

I just have a single select box without a form. There is a onChance Event on it that fires a Ajax request. But I do not know how to set this box. To use setSelectField does not work because it needs a surrounding form.

Any ideas how to do this?