In order to use the CK-12 FlexBook® textbook 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'.

Google Chrome

1. Click the wrench at upper right and click 'Options' from the drop-down menu.
2. Click the 'Under the Hood' tab.
3. Click 'Content Settings' button under 'Privacy' section.
4. Select 'Allow all sites to run JavaScript' under the 'JavaScript settings' drop-down menu.
5. Click 'Close'.

Apple Safari

1. Select 'Safari'/'Edit' from the top menu.
2. Choose 'Preferences'.
3. Click the 'Security' tab.
4. Select the checkbox next to 'Enable JavaScript'.
5. Close 'Preferences' by clicking the 'X' at the upper-right corner of the Preferences box.

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® textbook System.