Why not simplify your life a bit? Here's how to be automatically signed in to a Yahoo! link:
- Click the " Yahoo! Messenger" menu in Yahoo! Messenger.
- Select "Preferences."
- Click the "General" category.
- Enable the option "Automatically sign me in when I click a Yahoo! link in Yahoo! Messenger."
- Click "OK" at the bottom of the window.
You're finished!
Please Note: Uncheck the option to disable the feature.