I agree with all the other comments above and wanted to add that it is really hard to get enough potassium through supplements. You can use Morton's salt substitute and get quite a bit more potassium. I'm pretty sure the Atkins book talks about this too.

Try the calcium, magnesium and postassium and I'm sure those leg cramps will go away soon! And if you get a bad charlee horse, stand up and put all the weight on that leg. It will help relieve the pain quickly.

Good luck!