Setting up ownerships shares of a start-up

Starting a website and looking at ownership options. 3 people involved including 1 developer. The dev. will be working for free but wants an ownership stake. I have been told that this is the common set up for ownership- 30% to the idea guy. 45% to whomever is putting up the money and 25 to the dev? Is that standard? The idea dosent really require much upfront money so we don't really have a "money guy." Ay ideas? Any general guidelines? Thanks!