var counter = 1;

function shift(num, maxNum) {
	counter = counter + num;
	for(var i = 1; i <= maxNum; i++) {
		document.getElementById('photo_' + i).className = 'photoHidden';
	}
	document.getElementById('photo_' + counter).className = 'photoVisible';
	if (counter==maxNum)
		document.getElementById('photoRight').style.visibility = 'hidden';
	else
		document.getElementById('photoRight').style.visibility = 'visible';

	if (counter==1)
		document.getElementById('photoLeft').style.visibility = 'hidden';
	else
		document.getElementById('photoLeft').style.visibility = 'visible';

}

function imageChange(path, name, width)
{
	document.getElementById('imageDetail').src = "/images/none.gif";
	document.getElementById('imageDetail').src = path;
	document.getElementById('imageDetail').width = width;
	document.getElementById('imageDetail').alt = name;
	document.getElementById('imageDetail').title = name;
}

function getPos (id) {
	var output = new Object();
	var mytop=0, myleft=0;
	var obj = document.getElementById(id);
	while( obj) {
		mytop+= obj.offsetTop;
		myleft+= obj.offsetLeft;
		obj= obj.offsetParent;
	}
	output.left = myleft;
	output.top = mytop;
	return output;
}