function popup(url,type) {
	if (url.length > 0) {
		if (type=="video") {
			var videoPopup;

			videoPopup = window.open(url,"videoPopup",'width=450,height=450,scrollbars=no,screenX=100,screenY=50,top=100,left=40,resizable=yes,status=no,toolbar=no,location=no,menubar=no');

			videoPopup.focus();
		} else if (type=="glossary") {
			var glossaryPopup;

			glossaryPopup = window.open(url,'glossaryPopup','width=450,height=550,scrollbars=yes,screenX=100,screenY=50,top=100,left=40,resizable=yes,status=no,toolbar=no,location=no,menubar=no');

			glossaryPopup.focus();
		} else if (type=="3d") {
			var dddPopup;

			dddPopup = window.open(url,'dddPopup','width=470,height=700,scrollbars=yes,screenX=100,screenY=50,top=100,left=40,resizable=yes,status=yes,toolbar=no,location=no,menubar=no');

			dddPopup.focus();
		} else if (type.length > 0) {
			// type is a parameter list
			var params = "scrollbars=yes,screenX=100,screenY=50,top=100,left=40,resizable=yes,status=no,toolbar=no,location=no,menubar=no,"+ type;
			var popup;

			popup = window.open(url,'popup', params);

			popup.focus();
		}
	}
}