How do I turn off all the script error warnings in Internet Explorer?

Errors like “document.SelfHostedImage is null or not and object” are refering to the script on the web page that does not conform precisely with what IE expects. To avoid such messages (which don’t do anything useful for you since you could not in any case edit the web page’s script), go to Tools menu, Internet options, Advanced tab check the box ‘disable script debugging’ and uncheck the box ‘display a notification about every script error’, click Apply, OK.