function nextPhoto(inCount) {
	var count = eval(inCount);
	var digits = count < 10 ? 1 : 2;
	var element = document.getElementById('photo');
	if(element) {
		var addr = element.getAttribute('src');
		var n = addr.lastIndexOf('.');
		var prefix = addr.substring(0, n - digits);
		var current = eval(addr.substring(n - digits, n));
		var suffix = addr.substr(n);
		var next1 = (current == count) ? 1 : current + 1;
		var nextStr = next1.toString();
		element.setAttribute('src', prefix + nextStr + suffix);
	}
}

function prevPhoto(inCount) {
	var count = eval(inCount);
	var digits = count < 10 ? 1 : 2;
	var element = document.getElementById('photo');
	if(element) {
		var addr = element.getAttribute('src');
		var n = addr.lastIndexOf('.');
		var prefix = addr.substring(0, n - digits);
		var current = eval(addr.substring(n - digits, n));
		var suffix = addr.substr(n);
		var prev1 = (current == 1) ? count : current - 1;
		var prevStr = prev1.toString();
		element.setAttribute('src', prefix + prevStr + suffix);
	}
}