ZyXEL Communications NBG-419N User Manual page 191

In Internet Explorer, click Tools, Internet Options and then the Security tab.
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Figure 138 Internet Options: Security
Click the Custom Level... button.
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Scroll down to Scripting.
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Under Active scripting make sure that Enable is selected (the default).
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Under Scripting of Java applets make sure that Enable is selected (the default).
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NBG-419N User's Guide
Appendix A Pop-up Windows, JavaScripts and Java Permissions
191