Dragon20002, you can hide them by doing this, if you’re using IE, that is.
Go to Tools→Internet Options on your menubar. Click the tab Advanced, and look at the part where it says Browsing. There should be an option that says Display a notification about every script error. It should be ticked, and saying ON, and you need to untick it, then click OK.
The errors will still be there, but you just won’t see them.