[html] CSS Div Background Image Fixed Height 100% Width

I'm trying to setup a series of div's with a background image that each have their own fixed height, and stretch to fill up the width, even if there is overflow on the top/bottom that is clipped. I just don't want the white space on the edges.

Currently, I have: http://jsfiddle.net/ndKWN/

CSS

    #main-container {
        float:left;
        width:100%;
        margin:0;
        padding:0;
        text-align: center;
    }

    .chapter{
        position: relative;
        height: 1400px;
        z-index: 1;
    }

    #chapter1{
    background: url(http://omset.files.wordpress.com/2010/06/homer-simpson-1-264a0.jpg) 50% 0 no-repeat fixed;
        height:1200px;
    }

    #chapter2{
    background: url(http://download.ultradownloads.com.br/wallpaper/94781_Papel-de-Parede-Homer-Simpson--94781_1680x1050.jpg) 50% 0 no-repeat fixed;
        height:1200px;
    }

http://jsfiddle.net/ndKWN/1/

You can use background-size: cover;

But the thing is that the .chapter class is not dynamic you're declaring a height:1200px

so it's better to use background:cover and set with media queries specific height's for popular resolutions.