100% height div between header and footer

Question

I am trying to create a webpage layout with a header/footer (100% width, 145px height), a \'main area\' between the header/footer (100% width, dynamic height), and a contain

Answer 1

I think you need position: fixed on the footer:

footer {
    width: 100%;
    height: 30px;
    position:fixed;
    bottom:0;
}

Answer 2

FIDDLE: http://jsfiddle.net/3R6TZ/2/

Fiddle Output: http://fiddle.jshell.net/3R6TZ/2/show/

CSS

html, body {
    height: 100%;
    margin:0;
}
body {
    background:yellow; 
}
#wrapper {
    position: relative;
    min-height: 100%;
    vertical-align:bottom;
    margin:0 auto;
    height:100%;
}
#header {
    width: 100%;
    height: 150px;
    background:blue;
    position:absolute;
    left:0;
    top:0;
}
#content {
    background:pink;
    width:400px;
    margin:0 auto -30px;
    min-height:100%;
    height:auto !important;
    height:100%;
}
#content-spacer-top {
    height:150px;
}
#content-spacer-bottom {
    height:30px;
}
#divFooter {
    width:100%;
    height: 30px;
    background:blue;
}

HTML

<div id="wrapper">
    <div id="header">Header</div>
    <div id="content">
        <div id="content-spacer-top"></div>
        <div id="content-inner">
            **Content Goes Here**
        </div>
        <div id="content-spacer-bottom"></div>
    </div>
    <div id="divFooter">Footer</div>
</div>

UPDATE

The #content-spacer-top and #content-spacer-bottom are used to pad the #content div without using padding or margin that would increase the box size past the 100% height causing problems.

In CSS3, there is the box-sizing property (more info here) that can fix this issue, but i'm assuming you don't want to depend on CSS3 features.

EDIT

Added a fix and tested down to IE7

UPDATE 2

Alternate method using :before and :after pseudo-elements instead of the spacer divs: http://jsfiddle.net/gBr58/1/

Doesn't work in IE7 or 6 though, and to work in IE8, a <!DOCTYPE> must be declared (according to w3schools.com), but the HTML is nice and clean

UPDATE 3 (Sorry for so many updates)

Updated it to work down to IE6. I don't normally bother as my company doesn't support IE6, but it was an easy fix...