NULL bug with Norton Antiphishing option and IE8

In developing a web site, I came across what appears to be a bug with Norton Antiphishing.  I posted a sample web page (see link below) which demonstrates this bug.  I have Norton Internet Security 2010 installed and when using Internet Explorer 8 to display this web page, the word NULL appears in the text box.  If I turn OFF the Antiphishing option in NIS, the NULL bug does not appear.  I am wondering if this is a known bug with the NIS Antiphishing option and using IE8.  

Also, any help in fixing this NULL bug would be greatly appreciated.

Here is the sample web page which demonstrates this bug:
http://chefswiz.webs.com/NortonNullErrorTest.htm

Some things to note about this NULL bug:
1.  When using IE8, you must be in normal view.  The NULL bug does not appear when in Compatibility View.
2.  The NULL bug only appears using IE8, it does not appear using Firefox.  This may be due to the NIS plugin being different between IE8 and Firefox.
3.  The text box is a DOJO "dijit.form.ValidationTextBox".  The NULL bug also appears using a DOJO "dijit.form.TextBox".  It does not appear using regular HTML TextBox(es).  I am not sure how the Antiphishing option interacts with DOJO text fields.