Closing of IE or Netscape Browser

Hi,
I am looking for a sound solution on the following:
When we launch IE or Netscape, we have the 3 buttons Mimimize, Maximize and Cancel/Close.
When my page gets launched i want to make the
Cancel/Close button greyed out, and the user
should select only my Button or link to close the page.
How can i do it programmatically.
Thanks.