If you are Internet Explorer User:

1. Menu -> Tools -> Internet Options
2. Go to "Security" Tab and press "Default level" or "Custom level" if you want to keep your settings.
3. In "Custom level" go to Scripting -> Active Scripting and check "Enable" or "Promt option".
4. Press Ok

If you are Netscape Navigator User:

1. Menu Edit -> Preferences
2. Go to Advanced section
3. Check "Enable Java Script for Navigator"
4. Press Ok

If you have done this go here: History Web Site