Hi Markus,
#html, body {
height:100%;
}
#content {
min-height:100%;
}
* html #content{ /* hack for IE min-height /*
height:100%;
}
#footer {
margin-top: -20px; /* minus Höhe in px /*
height:20px;
position:relative;
bottom: 0;
left: 0; /* oder was auch immer /*
}
<div id="content"></div>
<div id="footer"></div>
Gruß
Antipitch