Fullscreen Background Image

Hi I am building a fullscreen website and i have a image i want to use as the background. The code i am using achieves the fullscreen image effect but the image warps and stretches when i scale the browser.

I need to make the image scale with out warping, this is very common in flash sites and a example can be seen here, agmint.com


Their are allot of people it seems wondering the same thing and nobody has an answer. I don't think it is a hard thing to solve but that people are reluctant to give up the code for this powerful effect.

Any help would be great, Thanks, Gabe.

Are you setting your height and width = 100? If not it could display at the wrong proportion.