Windows: Automating the filling of a simple form in Intenet explorer 8

I am trying to automate filling of this simple form and get into the website to do some monitoring task. Can't disclose the id and password

http://ift.tt/1aI2n3I

The problem is that this site only works in Internet Explorer 8. I know some coding and I have figure out a way with vbs script, but its not working and give this error

Z:\000-Working_on\007- SDM script\checkitv1.vbs(6, 3) Microsoft VBScript runtime
 error: Object doesn't support this property or method: 'getElementsByName'

This used to work. Please guide me get past this window with any coding language and I will figure out and learn the language to automate the rest.

Right now my only requirements are 1. To fill the Username and Password field with any junk. 2. Click the Submit button.

You can use any language to achieve this.