jbre1,
Somehow your homepage just got set to that weird address.
Simply open up Safari, and click on "Safari" up in the top left corner of your iMac. Then click on "preferences."
Once preferences opens up, make sure you are in the "General" section found in the top left corner of preferences.
Simply go to Home page: and type in whatever you'd like your homepage to be (Example:
http://www.yahoo.com)
Once that's done, simply close out of preferences by clicking on the red circle in the top left corner.
From now on, when you open up safari, it should come up to your homepage of choice.
cheers.