I have been informed that there are error reports

http://www.cumbwestmasons.co.uk/index2.html
I have a feeling that the user reporting the errors has Tiscali as the default browser. The error reports * Error:syntax error * Code:0 * NB: *. I have checked this through IE and there is no sign of an error.
Is this a problem with the Milonic Menu and Tiscali OR a problem with the web site and Tiscali OR the user's system that is at fault?
I would appreciate any response to help me.
Sandy Rogers
PS I have tried to get to grips with v4.0 beta and have not managed
