Can I use a garage band music (chelsea loft long song) as a music background in my website?

You can use GarageBand songs created using the loops freely, as long as you do not distribute the loops as loops.

Here is a link to an Apple document:

http://support.apple.com/kb/HT2931?viewlocale=en_US&locale=en_US

The music is copyrighted, but you have a royalty free licence to use it. Because of the copyright I would include an acknowledgement when you use the loops.

The GarageBand software license agreement says:

"GarageBand Software. You may use the Apple and third party audio loop content (Audio Content), contained in or otherwise included with the Apple Software, on a royalty-free basis, to create your own original music compositions or audio projects. You may broadcast and/or distribute your own music compositions or audio projects that were created using the Audio Content, however, individual audio loops may not be commercially or otherwise distributed on a standalone basis, nor may they be repackaged in whole or in part as audio samples, sound effects or music beds."

So don't worry, you can make commercial music with GarageBand, you just can't distribute the loops as loops.