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هذا من Internet Explorer 5.5 Help :

To set a security level for each zone

On the Tools menu in Internet Explorer, click Internet Options.
Click the Security tab.
Click the zone that you want to set the security level for.
Move the slider up for a higher level of security or down for a lower level of security.
Notes

To specify custom security settings for the selected zone, click the Customize Level button. To set the options for a particular security level back to their original settings, click the Default Level button.
For Restricted sites, you need to click Custom Level and then click a level in the Reset to list.