Hey all, instead of having sleepless nights and waking up to all my gains gone I was wondering if there is a way of (in either mtgox or bitstamp) setting a sell trigger for my bitcoins?

Say for instance I go to bed tonight and the price of bitcoins goes below $250 then it runs a macro to sell x amount of coins.

I was lucky to be awake during the last crash so escaped - but with China involved this time and me being from the UK there is a high chance it'll all happen when I'm asleep.

Thanks!