function manualActivitySwitch(b, div) {
	activityRotater = 0;
	if (div == null) div = 'activities-display';
	activitySwitch(b, div);
}
function activitySwitch(b, div) { 
	if (div == null) div = 'activities-display';
	var els = document.getElementById(div).getElementsByTagName("*");
	for(i = 0; i < els.length; i++) {
		switch(els[i].tagName.toLowerCase()) {
			case 'h1': 
				els[i].style.display = (els[i].id == 'ad-h1-' + b ? '' : 'none');
				break;
				
			case 'h2': 
				els[i].style.display = (els[i].id == 'ad-h2-' + b ? '' : 'none');
				break;
				
			case 'img': 
				els[i].style.display = (els[i].id == 'ad-img-' + b ? '' : 'none');
				break;
				
			case 'a':
				if (els[i].className == 'activity-numbers' || els[i].className == 'activity-numbers-selected') {
					els[i].className = (els[i].id == 'ad-a-' + b ? 'activity-numbers-selected' : 'activity-numbers');	
				}
			
		}
	}
}
function rotateActivityItems(i, div) {
	if (activityRotater == 1) {
		if (div == null) div = 'activities-display';
		activitySwitch(i, div);
		i++;
		if (i >= numActivities) i = 0;
		setTimeout('rotateActivityItems(' + i + ', \'' + div + '\')', 5000);
	}
}
function jumpToEventFrontmatter(div) {
	if (div == null) div = 'activities-display';
	var els = document.getElementById(div).getElementsByTagName("a");	
	for(i = 0; i < els.length; i++) {
		if (els[i].className == 'activity-numbers-selected') {
			window.location.href = document.getElementById(els[i].id.replace('ad-a', 'hidden-i')).value;	
		}			
	}
}