Internet Explorer
1. Click on menu Tools, then click Internet Options.
2. Click Security tab.
3. Click Custom Level button.
4. Scroll down until you find the line Scripting.
5. At Scripting, in Active Scripting, check on Enable.
6. Click OK 2 times.
Firefox
1. Click Tools, then click Options.
2. Click Content tab.
3. Check on Enable JavaScript.
4. Click OK.
Chrome (v.19)
1. Click on menu Settings.
2. Click Show advanced settings...
3. At Privacy, click Content Settings button.
4. At Javascript, check on Allow all sites to run Javascript.
Opera
1. Click on menu Settings > Preferences.
2. Click Advanced tab.
3. Click Content category.
4. Check on Enable Javascript.
5. Click OK.