Multiple button for submit form

[turb]

Hi!

i need to know how we can have 2 input button for a same form. Like this forum, when you post a new thread, you have 2 buttons:

SUBMIT NEW THREAD
PREVIEW POST

I'm using php so how can i know on the submit page what button have been click????

[olaf]

Its really safe to do this in PHP with:

If (isset($submit) && ($submit == "Preview")) {
do something
}

you can use the same if clause with a different submit name