In order to use the CK-12 FlexBook system, you will need to have JavaScript enabled in your browser.

To do so, please follow the instructions below:

Internet Explorer (6.0 & 7.0)

1. Select 'Tools' from the top menu
2. Choose 'Internet Options'
3. Click on the 'Security' tab
4. Click on 'Custom Level'
5. Scroll down until you see section labled 'Scripting'
6. Under 'Active Scripting', select 'Enable' and click OK

Mozilla Firefox (1.5+ & Up)

1. Select 'Tools' from the top menu
2. Choose 'Options'
3. Choose 'Content' from the top navigation
4. Select the checkbox next to 'Enable JavaScript' and click OK

Apple Safari

1. Select 'Safari' from the top menu
2. Choose 'Preferences'
3. Choose 'Security'
4. Select the checkbox next to 'Enable JavaScript'

Please keep in mind that upgrading your browser or installing new security software or security patches may affect your JavaScript settings. It is a good idea to double-check that JavaScript is still enabled if you notice problems displaying in the CK-12 FlexBook System.