function popup(URL, w, h, args) {
	var chasm = screen.availWidth;
	var mount = screen.availHeight;
	if (!w) { w = 740; }
	if (!h) { h = mount - 80; }

	var features =
		'width=' + w + 
		',height=' + h + 
		',left=' + ((chasm - w - 10) * .5) + 
		',top=' + ((mount - h - 150) * .5) +
		',scrollbars=yes' +
		',resizable=yes';
		
	if (args) {
		URL = URL + escape(args);
	}
	if (!new_window) {
		var new_window = window.open (URL, 'ErikaKendrickGallery', features);
		if (new_window) new_window.focus();
	}
}