Assuming you are a first time buyer, there are a number of programs available to you that require little down. In some cases you can get the seller to credit you a portion of the down payment too. I would contact a mortgage professional to talk about what you may qualify for. You should also check out the following websites for more information about first time programs.
If you are not a first time buyer, meaning you have owned someting within the past 3 years, then it will be much harder to purchase something with so little down.
Feel free to contact me if you need a referral on a mortgage pro or if you have any other questions.