exception in IE on ajax request

[Ray Nicholus]

I'm seeing the following javascript exception in IE only when the
ajaxRequest function is called in tapestry.js:

 Object doesn't support property or method 'call'


I've confirmed that successHandler is not null, and call appears to be
available as a native function. as one would expect.  Any idea what is
going on here?  The code below is from ajaxRequest in tapestry.js.


                    try {
                        /* Re-invoke the success handler, capturing any
exceptions. */
                        successHandler.call(this, response, jsonResponse);
                    } catch (e) {
                        finalOptions.get('onException').call(this,
response);
                    }