this isn't a problem at your end, it's a problem with the scripts on the website.
Obviously yo can't fix the scripts on the web page, but you can ignore the errors.
to do this (I assuem you are using internet explorer)
click on the tools menu and select Intern Options.
select the advanced tab (It's the last one).
you'll see a list. in the browsing section you'll see a check box labled Disable script debugging, if you check this you won't be alerted to any more script errors on webpages.