Irrlicht Engine

Hi there, i'm making a small RPG in Irrlicht. I've got a moveable camera, i change rotation with left and right, and zoom in/out with up and down, and W,A,S,D for moving character. But how can I zoom in/out the camera with the mouse scroll? scrolling up is zoom in, and scrolling down is zoom out.
Can anybody help me?

.. http://irrlicht.sourceforge.net/phpBB2/search.php

i just tried and found something already

There's a thread over here:
http://irrlicht.sourceforge.net/phpBB2/ ... hp?t=32033
Where a guy has posted his mostly working camera/movement code twice. I'll let you do the rest.