Sorry to be dense, but Bill Clinton would have asked exactly what exactly "it" is...
when i click next it moves
The highlight, the selection or the node? The up/down arrow keys work nicely for selection, and Volpe's code appears sufficient for emulating their behavior (...although if you are relying on mouse imput, why not just select the desired node with the mouse?)
This leads me to wonder if you might want to move the node up and down. That's not so easy, but the attached demo shows that it is possible. As written, however, nodes won't leave their original family -- but there's no reason why that couldn't be worked out as well.
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