I am creating a website which will store the registered members
favorite URL's in my website. for this activity i use the Google
Toolbar's Custom button functionality.

i have created an XML file to do this function as per Google
Conditions listed in Google website  :  http://toolbar.google.com/buttons/apis/howto_guide.html

this is working fine with Firefox and other browsers, but this is not
working with Internet Explorer

This custom button installed in users browser will redirect to my
website with the Current browser's URL of that the user is viewing.

but in IE i cant get the URL of the User Viewing rather than i get an
error message saying,

"The server encountered an internal error or misconfiguration and was
unable to complete your request.

Please contact the server administrator, webmaster@n... and
inform them of the time the error occurred, and anything you might
have done that may have caused the error.

More information about this error may be available in the server error
log.

Additionally, a 404 Not Found error was encountered while trying to
use an ErrorDocument to handle the request. "

Please suggest me what will be the error
Thanks
Kris Dass