html, body {height: 100%;}
 
#wrapper1 {min-height: 100%;}
 
#wrapper2 {
	overflow:auto;
	padding-bottom: 16.5em;   /* must be same height as the footer */
}
 
#footer {
	margin: -16.5em 0 0 0; /* negative value of footer height */
	height: 16.5em;
}