First - thanks very much for the replies!!!
Ok, now using the error console and I was getting at least one syntax error - added a missing curly bracket. Now I'm getting the following error but I'm not sure why the function is null or undefined or not an object. I defined it in the head of the document, etc. The xml file which it points to is there on the localhost in the path specified, so not sure what's up.
SCRIPT5007: The value of the property 'getData' is null or undefined, not a Function object
BTW, can you recommend a good free dev environment?