It depends the amount of money you invested here.
It´s a risky stock with wild movements
You should buy it and stick with them unless you need the money to pay the rent or the food.
In that case, well if you dont eat you will probably die
that depends upon how badly you need the money and what you can get. If it drops to say ... $.80, then you might as well hold, but if it recovers and hangs around the $1.40 level, then sell a big chunk. If it is in between, then ask yourself that question again and reassess.
It really depends if you are in this for a trade or an investment. For a trade, sure sell. It is hard to say where this will go over the short term. If you believe in the turn around story of Jamba as many do, then hold your investment in it. JMBA will be worth much more once they are profitable, growing again, and posting positive SSS #s quarter after quarter. That can't happy in the next week, so you'll have to wait for the really good returns.
Look at the MACD, ADX, volume...if you don't understand these things than go to stockcharts.com and (http://www.stockta.com/cgi-bin/analysis.pl?symb=JMBA&num1=575&cobrand=&mode=stocklook)...look at charts. Check out more than one analyst site,learn more, get educated about stocks, make the best decision and then decide for yourself.
Look at the after hours volume. A lot of things could happen. I am helping your out here.