Javascript confirm reset button

In my form, i want the reset button to bring up a confirm box that confirms they want to clear the form.

It needs to clear the form if they click ok, and do nothing if they click cancel.

I had the code for this before, but lost it

How do i get this done?

umm... i may need a little more input than that

would i do it with something like this?

<script>
function clearConfirm() {
  If confirm('Are you sure?');
    return true;
  else
    return false;
}
</script>

<input type="reset" onClick="clearConfirm()">

I know this doesn't work, but is it going to be similar to this?