For the most part, debt funding (loans) are not available to startups, unless there's some substantial collateral (e.g., a 2nd mortgage on a house). But there are online lending sources that do make small loans ($25,000 or so) to small businesses, including Prosper.com, Zopa Inc., GlobeFunder Ventures Inc., Virgin Money USA and Lending Club.
But be warned - many micro-fund loans require a personal guaranty. So if the business can't pay the loan back, you may be personally liable. Read the small print!