XML and Ajax not working in Internet Explorer?

Please try this in IE...

this file communicates with the php file using Javascript

http://nyoc.net/test/x-Cellus/include/additems.php

this is the php file to add the information via Sessions

http://nyoc.net/test/x-Cellus/include/addToCart.ph...

this is the Javascript file that communicates between the two

http://nyoc.net/test/x-Cellus/include/addToCart.js

Now I'm assuming that there is an error with my javascript file for handling IE requests because it works fine in Mozilla but not explorer

please go to the additems.php and enter a 1 in the first field and 2 in the second... click the button. next to where it says Suggestions:.... a "2" should appear... and does so in Mozilla. This is done because on my addtocart.php i have echo $_GET['secondfield']

anyway please help and find the error in my js file!! please help thank you so much

alex