ok. in my view, you have done nothing wrong from your side.
script errors usually come because of a few bugs of script language on a website (eg maybe someone wrote wrong code syntax etc).
to remove these alerts, you can do the following
1. go to control panel > internet options
2. go to advanced
3. look at the browsing category
4. TICK "Disable Script Debugging"
5. UNTICK "Display a notification of every script error"
6. Apply settings
you should now stop getting the messages.
~Rajiv
