Errors on external web page syntax errors, only as staff!

[jonnykewell1]

We are using the site DL Online - Login and when we fill in our information on the home page and press login nothing happens when staff are logged in. In the bottom corner it displays errors on page related to syntax and .axd files? Now looking around this points to possible java script errors. So I ran a check and the browser definitely has Java script enabled and it's nothing to do with pop up blocker as I checked this when logged in as me on the computer and that is ticked as blocked. I have also looked at group policies and I can not think of anything obvious which would stop the browser functioning as normal. Does anyone have any ideas?

 

thanks