TextArea runtime help

[anki...@gmail.com]

I am using a simple HTA application. I have made a drop down box which
has a few values. Depending upon values selected in the drop down box
appropriate message has to be displayed in textarea.

Can anyone help me? I have defined the textarea in the body section. I
am not sure where I have to put the code.

Let me know if possible with code example.

Thanks
Dave