Ryan, call me Cutter. I adjusted my code example, adding back in the lines where you set the cfinvoke returns to the temp object keys. The notation used will preserve the casing of those key names when CF serializes the object into JSON. Unfortunately you can't use that notation in the returnvariable attribute, so you have to jump a few hoops.

Have you looked at JQuery? You could probably right this in two or three lines of code...

I had to go back and check the JQuery docs again, as I was sure I had read it the other day. Sure enough, documentation of the .ajax() method options tells you this about the beforeSend option: "A pre-request callback function that can be used to modify the jqXHR (in jQuery 1.4.x, XMLHTTPRequest) object before it is sent." api.jquery.com/jQuery.ajax