html, body {
	height: 100%;
}
#wrapper {
	width: 100%;
	min-height: 100%;
	height: auto !important;
	height: 100%;
	margin: 0 auto -40px; /* the bottom margin is the negative value of the footer's height */ 
}
#footer, #push {
	height: 40px; /* .push must be the same height as .footer */
}