In Internet Explorer:
On web browser menu click "Tools" menu and select "Internet Options".
In the "Internet Options" window select the "Security" tab.
On the "Security" tab click on the "Custom level..." button.
When the "Security Settings - Internet Zone" dialog window opens, look for the "Scripting" section.
In the "Active Scripting" item select "Enable".
When the "Warning!" window pops out asking "Are you sure you want to change the settings for this zone?" select "Yes".
In the "Internet Options" window click on the "OK" button to close it.
Click on the "Refresh" button of the web browser to refresh the page.
In Firefox:
On the web browser menu click "Tools" and select "Options".
In the "Options" window select the "Content" tab.
Mark the "Enable JavaScript" checkbox.
In the opened "Options" window click on the "OK" button to close it.
Click on the "Reload current page" button of the web browser to refresh the page
In Firefox Version 23+:
In the address bar, type about:config and press Enter.
Click "I'll be careful, I promise" if a warning message appears.
In the search box, search for javascript.enabled
Toggle the "javascript.enabled" preference (right-click and select "Toggle" or double-click the preference) to change the value from "false" to "true".
In Chrome:
On the web browser menu click on the "Customize and control Google Chrome" and select "Settings".
In the "Settings" section click on the "Show advanced settings..."
Under the "Privacy" click on the "Content settings...".
When the dialog window opens, look for the "JavaScript" section and select "Allow all sites to run JavaScript (recommended)".
Click on the "OK" button to close it.
Close the "Settings" tab.
Click on the "Reload this page" button of the web browser to refresh the page.