Well, the script looks like fantasy.premierleague.com
It works like this: Our starting money is 100 milion. With that money, we must buy 15 players from 20 clubs available. We have to spend our 100 milion on 15 players. If we buy the player, our money will be dismished. For example : Our money is 100 million. Then I buy player named Gallas which is cost 6.5 million. So, our remaining money is 93.5 million. I only need that calculation script, so please help me to create it?!

What are we working from right now? Do you have a site at all? Do you have any databases setup? It would help to know where exactly you're coming from to do this otherwise it'll be just a shot in the dark as to what would work best.

I have site. Please make the calculation script like the site above.