function initPopups ()
{
	var W3CDOM = (document.getElementById && document.getElementsByTagName);
	if (!W3CDOM) return;
	var as = getElementsByClass ('popup',document,'a');
	for (var i = 0; i < as.length; i++)
	{
		if (as[i].getElementsByTagName ('img').length > 0)
		{
			as[i].onclick = function ()
			{
				var imgsrc = this.href;
				var img = new Image();
				img.src = imgsrc;
				img.onload = function ()
				{
					var dims = [img.width,img.height];
					popImage(dims,imgsrc);
				}
				return false;
			}
		}
	}
}

function popImage (dims,imgsrc)
{
	var width = dims[0];
	var height = dims[1];
	var win = window.open ('http://www.thermoanalytics.com/js/image.html?url='+imgsrc,'popwin','width='+width+',height='+height);
}

function getElementsByClass(searchClass,node,tag) {
	var classElements = new Array();
	if ( node == null )
		node = document;
	if ( tag == null )
		tag = '*';
	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp("(^|\s)"+searchClass+"(\s|$)");
	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}

window.onload = initPopups;