var activeId = 'thumb8';

window.onload = function() {
	if(!document.getElementById) return;
	calendarLink();

	document.getElementById(activeId).className = 'on';

	var thumbnails = document.getElementById('thumbnails').getElementsByTagName('a');

	for(var n = 0; n < thumbnails.length; n++) {
		var a = thumbnails[n]; 

		a.onclick = function() {
			if(this.className != 'on') {
				this.className = 'on';
				document.getElementById(activeId).className = '';		
				activeId = this.id;
				var bigphoto = document.getElementById('photo1'); 
				bigphoto.src = this.href;
			}			
			return false;
		}
	}
	
}