function changePreview(itemNumber) {
	document.getElementById('mac0').style.display = 'none';
	document.getElementById('mac1').style.display = 'none';
	document.getElementById('mac2').style.display = 'none';
	document.getElementById('mac3').style.display = 'none';
	document.getElementById('mac4').style.display = 'none';

	document.getElementById('macbox1').style.background = 'none';
	document.getElementById('macbox2').style.background = 'none';
	document.getElementById('macbox3').style.background = 'none';
	document.getElementById('macbox4').style.background = 'none';

	Element.hide('mac' + itemNumber); new Effect.BlindDown('mac' + itemNumber, {duration:.35});

	document.getElementById('macbox' + itemNumber).style.background = 'url(/images/landingicons/mac/macbox.background.png)';
	tds = document.getElementById('mac').getElementsByTagName('TD');
	for(i=0;i<tds.length;i++) {
		if(tds[i].className == 'active menu') tds[i].className = 'menu';
	}
}




function puff(element) {
	document.getElementById('element').style.display = '';
	}