The only hint I can give is to look through the MooTools API
documentation. But for your convenience, you can compare your original
script to the this (untested) version:

window.addEvent('domready', startnavigation);

function startnavigation(){
        window.addEvent('scroll', function(){
                var scrolltop = window.getScroll().y,
                        navigation = document.id('navigation');

                if (scrolltop >= 320){
                        if (Browser.ie6) navigation.setStyle('top', (scrolltop 
- 330));
                        else navigation.setStyles({position: 'fixed', top: 
-60});
                } else {
                        if (Browser.ie6) navigation.setStyle('position', 
'absolute');
                        else navigation.setStyles({position: 'relative', top: 
0});
                }
        });
}

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