ZaZa.. sounds like the script you used for the World Clock has messed something up. Try disabling Javascript in your browser and see if you can get in and remove that script.
To disable Javascript in Firefox:
Tools > Options > Content > take checkmark out of "enable Javascript" in Firefox
To disable Javascript in Internet Explorer:
From the Tools menu, choose Internet Options... .
Click the Security tab.
Click Custom Level... .
Scroll to the "Scripting" section of the list. Click Disable or Enable.
Close and restart your browser.