H1b Transfer during Cap gap

[sriXXX]

HI,

My current employer applied for this year(2013) H1b Visa. and i  got approved  in the Lottery. Right now,i am in my Cap Gap status(opt Extension expired on July 27th).can i move to a different company now,when i am still in my Cap gap. if so will my H1b be still valid with new company(when they do my H1b transfer to there company) or should i wait till October 1st , when my H1b starts, and then only, will i be able to change company ?

i  greatly appreciate your help and suggestions on this.