This information applies to Windows Internet Explorer 7 and Windows Internet Explorer 8.
In most cases, you can ignore them. Script error messages are displayed by Internet Explorer when there is a problem with the JavaScript or VBScript code on the website you are viewing. Occasionally a script error can be caused by an error in downloading a webpage, but more often it is an error in the webpage itself.
To be sure it isn't an error in downloading, refresh the webpage (click the Refresh Current Page button). If the error persists, and you are not a developer testing a website, you should click No to ignore the error.
To avoid script errors in the future, you can turn off script debugging and notifications in Internet Explorer.