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Microsoft Internet Explorer
* go to Tools
* then Internet Options...
* select the Security tab
* press the Custom Level button
* scroll down to Scripting
* enable Active Scripting

Firefox
* go to Tools
* then Options...
* select the Content option
* tick Enable JavaScript

Mozilla
* go to Edit
* then Preferences...
* select the Advanced category
* click Scripts & Plug-ins
* Enable JavaScript for Navigator

Safari
* go to Safari
* then Preferences
* select the Security tab
* under Web Content tick Enable JavaScript

Konqueror
* go to Settinigs
* then Configure Konqueror
* select the Java & JavaScript category
* choose the JavaScript tab
* tick Enable JavaScript globally

Opera
* go to Tools
* then Perferences
* select the Advanced tab
* choose the Content category
* tick Enable JavaScript