My domain (modecideas.com) is under attack!

Only an hour or two ago I started getting reports that people accessing my website were getting different pages from usual. My domain is http://modecideas.com (hoping it stays mine). The result demonstrates that someone has altered my domain registration records. It looks like a deliberate and well planned attack to hijack my site visitors to their pages. There was even a mock-up of a different design using my domain name. This goes well beyond annoying! It's as if someone stole my car!