function image_popup(a)
{
	var opts = "toolbar=no,directories=no,menubar=no,resizable=no,scrollbars=no,width=800,height=600,left=0,top=0";
	window.open(a.href, a.target, opts);
}

var anchors = document.getElementsByTagName('a');

for (var i = 0; i < anchors.length; i++)
	if (anchors[i].rel == 'popup')
		anchors[i].onclick = function() { image_popup(this); return false; };