Liposuction is a stupid answer. Sorry, but it is.
Liposuction will get rid of the fat straight away, but it won't stop you from getting it again. It's a quick fix.
As already mentioned, forget things like crunches until you've lost the weight. Get down the gym and start cardio training. Once you start losing the inches, you can go onto weights and get that stomach nice and tight.
And yeah, it is hard work, but once you start seeing the results, there'll be no stoping you! Good luck! :)