JS-created Table Doesn't Show In IE?

what is wrong in the following piece of code? It works fine in Firefox, Safari, Chrome and Opera, but won't work in IE.

The purpose of the function is to receive a list of discussion threads that are available on the site and list them in a simple table, which is created by the function and placed in a div. More specifically:

(1) The function receives a json called "threads" (obtained through Ajax from a server-side PHP script).

(a) The 2nd element in the json, "records" is an array of records, one record for each thread.

(b) The 1st element in the json, "fields", identifies the integer keys of the id and title of each thread in the corresponding record.

(2) The function creates a table with one tr for each thread record. In each tr, there is one td with the thread's id and one with its title.

(3) Finally, the function places the table in a div with the id "discBdCont".

In both Firefox, Safari, Opera and Chrome, the table appears as it should. In IE, however, the table does not appear at all (although the text "Available discussion threads:" does appear, and I see no error messages or anything).

Code:

var discBoardRecords;
var idKey;
var titleKey;

[Code]....