function changePreview(itemNumber) {

	document.getElementById('infotable1').style.display = 'none';

	document.getElementById('infotable2').style.display = 'none';

	document.getElementById('infotable3').style.display = 'none';

	document.getElementById('infotable4').style.display = 'none';

	document.getElementById('infotable5').style.display = 'none';

	document.getElementById('infotable6').style.display = 'none';

	document.getElementById('infotable7').style.display = 'none';

	document.getElementById('infotable8').style.display = 'none';

	document.getElementById('infotable9').style.display = 'none';

	document.getElementById('infotable' + itemNumber).style.display = '';

	tds = document.getElementById('infotable').getElementsByTagName('TD');

	for(i=0;i<tds.length;i++) {

		if(tds[i].className == 'active menu') tds[i].className = 'menu';

	}

}