If you have multiple submit buttons on a form, how do you set which one the default is?

What's the matter ?

A form can only submit to 1 place, so any button will submit the same datas to the same place.

You may have more, I used forms for my site portofolio navigation, and they had Prev, Next and so on.
As far as I know, you can't have a default submit button. If the user hits enter, after introducing data, the first button (set as default by the browser, as being the first found) is used. but you may use text links instead of buttons, for the rest of them.

Here is the senario and I need it this way and no other.

I have one form tag with multiple buttons, I need to select which button to put as the default submit button. I can not have multiple form tags (trust me). Must work in both IE and Firefox.

You can have multiple buttons in one form, but you cannot have default button because each button do some stuff (I hope). In that case you can have one main button, but this button is not different from others. For example if first button redirect on your home page, second on your contact form and third to your payment form, then last one can be main and important for you but it is not default.

Shivaji