var showDiv = '_1988';

function switchCal(cal)
{
	document.getElementById('div'+showDiv).className = 'hidden';
	document.getElementById(showDiv).className = '';
	document.getElementById('div'+cal.id).className = '';
	cal.className = 'active';
	showDiv = cal.id;
}
function switchImg(nr,desc)
{
	document.getElementById('img_big').src = 'images/big'+nr+'.jpg';
	document.getElementById('img_desc').innerHTML = desc;
}