The jumping spider family, Salticidae, contains more than 5000 species of jumping spiders. The best way to avoid a jumping spider is to get rid of it, either by catching it with a tissue or using a flyswatter to squish it.
*Phidippus audax* is a common spider in the United States. and is among the larger American jumping spiders. Its body length is about 0.5 inch. The largest jumping spider, *Hyllus diardi*, is about 1 inch long, but they are not found in the U.S.
I just caught a spider that matches this description. After looking online, I think it may be a jumping spider from the family Salticidae. I believe that spider is Phidippus Audax a.k.a the Bold Jumping Spider.
Jumping spiders are a family of spiders that jump (the salticidae family of spiders). 13% of spider species are jumping spiders. For more information get a book on them, visit http://salticidae.org, or check out the informative wikipedia article on jumping spiders.
If this is a relatively small spider, then I would suggest that it is a Jumping Spider, and more specifically, possibly a Daring Jumping Spider. Read about Jumping spiders at the below link...(and sorry if this is not what it is.) http://au.answers.yahoo.com/question/index?qid=20071107223852AAzJ1vz