My wife held a valid F2 visa, which will be expired in Mar, 2008. She got a job offer this month, and filed an application for H1B visa. Now the H1B is approved, but it will be valid until this Oct. We want to have a trip to Europe in the coming August. MY question is: 1) Is there any risk for us to travel out of us before Oct? 2) Should my wife need to apply new visa when we return to U.S from Europe? Thanks a lot!