It's an old tradition in England to cross your fingers when wishing for good luck. e.g. "Lets keep our fingers crossed for good weather tomorrow" Fingers and toes crossed is a bit of a joke actually...wishing a bit TOO hard you might say.

It means wishing for good luck. "Fingers crossed" is normally used, when they say toes they mean they're wishing harder.

i cant understand your sentence Alper. Is that a idiom ?