On 29 Mar 2010, Jason Hale wanted to use the spreadsheet cursor location to select an e-mail address for a Javascript app he was writing - See http://productforums.google.co
Have you tried a simple function like this one ?
function getRCposition(){
var ss = SpreadsheetApp.getActiveSpreadsheet();
var cell = ss.getActiveCell();
var R = cell.getRow();
var C = cell.getColumn();
Browser.msgBox('Row = '+R+' and Col = '+C);
}
or a more 'universal' function like this :
function getposition(){
var sh = SpreadsheetApp.getActiveSheet();
var ss = SpreadsheetApp.getActiveSpreadsheet();
var range = ss.getActiveRange();
var R = range.getRowIndex();
var C = range.getColumnIndex();
var W = range.getWidth();
var H = range.getHeight();
var A1not = range.getA1Notation();
Browser.msgBox('Row = '+R+' / Col = '+C+' Width = '+W+' / Heigth = '+H+' A1 notation = '+A1not);
}