body{
	margin:0 auto;
}
#col1{
	background-color:red;
	width:20%;
	float:left;
	margin-bottom:-5000px;
 	padding-bottom:5000px;
}
#col2{
	background-color:blue;
	width:60%;
	float:left;
	margin-bottom:-5000px;
 	padding-bottom:5000px;
}
#col3{
	background-color:yellow;
	width:20%;
	float:left;
	margin-bottom:-5000px;
 	padding-bottom:5000px;
}
#footer{
	height:40px;
	clear:both;
	background-color:black;
	color:white;
	width:100%;
	margin-bottom:-5000px;
 	padding-bottom:5000px;
}