Kush: When you arent around you can put a good til cancel order on it, and it will execute once it gets to that price. If you set the sell at a level below where it opens, the sale will go thru at the bid price. There is also a stop sell, which would automatically sell the stock, if it went below a certain price, but not many brokers allow that for bulletin board stocks.
Kush best thing to do would on WNMI for you if your not sure and want to keep some cash is sell half and let the other half ride out.That way you got your money out and can ride for free on the other stuff as nobody knows how high these stock go.