How to disabling Cross Site Scripting (XSS) filtering in Internet Explorer 8
Open Internet Explorer 8, From the tools menu select the last item displayed, titled “Internet Options”.
Click on the “Security” tab in the internet Option panel, then click on the “Custom level” button three quarters down the panel.
Scroll down the list presented in the “Security Settings –Internet Zone” panel and, locate the “Enable XSS filter” option (this is almost at the end of the list)
Select the “Disable” option, then click the “OK” button to close the panel and, save your changes. Click the “OK” button on the “Internet Options” to close an save any changes. Restart Internet Explorer 8.
For more information on cross-site scripting visit this link.