<header>Top</header>
<section>Content<section>
<section class="ss">Content</section>
<footer>Footer</footer>

<style>
body{text-align: center; color: #333; font-family: arial;}
header{ height: 15px; padding:15px; background: #ccc;}
section{ height: 1550px; }
section.ss{ height: 50px; background: #fff;}
footer{width: 100%; height: 15px; padding:15px; background: #ddd; position: fixed; bottom: 0}
</style>

En basit halini bu şekilde test edebilirsiniz. Sorununuz daha farklıysa pm alabilirim.