Dai - is this what you were looking for?
function onDigitizedPoint(map, point)
var xyPt = map.lonLatToMcs(point.getX(), point.getY());
var resource = (parent.Eelgrasstop.document.Add.Feature_Type.value);
var loc = "Add_Point.cfm?LAT=" + point.getY() + "&LON=" + point.getX() + "&EAST=" + xyPt.getX() + "&NORTH=" + xyPt.getY() + "&RESOURCE=" + resource;
win = window.open(loc,"AddPoint","status=no,resizable=yes,scrollbars=yes,width=750,height=280");
alert("No available at this time.");
How does this code work with the function?