Help with multiple select boxes

[eluser]dobbler[/eluser]
I have a multiple select box that I'm trying to get the values of on form submission. All I'm getting is the last one.

I've tried:

for ($i=1; $i<=count($this->input->post('appbox2')); $i++) {
echo "ID: " . $this->input->post('appbox2') . "<br />";
}

Just to see what's being sent but it's only showing the last value in the box.

I'm sure this is simple but it's driving me nuts..

Thanks.