[wordpress-plugin-ajax-calendar-with-future-posts] Ajax Fails in IE

Works beautifully in FF and fails totally in IE7-9 (not tried 6, but hey).

Get the Javascript error…
Line: 254
Character: 36
Code: 0
Error Message: Unknown runtime error

254 function show_micro_ajax(response){document.getElementById('wp-calendar').innerHTML=response;}
                                        ^

Any ideas?
Why are you using microAjax and not jQuery? jQuery is already loaded with wp in any case (mostly).

http://wordpress.org/extend/plugins/wordpress-plugin-ajax-calendar-with-future-posts/