#left_column {
	float: left;
	width: 160px;
	min-height: 640px;
	background-color: #f0f0f0;
	padding: 5px 10px 5px 10px;
} 
#center_column {
	float: left;
	width: 630px;
	min-height: 640px;
	background-color: #ffffff;
	padding: 5px 0px 0px 0px;
} 

#right_column {
	float: left;
	width: 160px;
	min-height: 640px;
	background-color: #f0f0f0;
	padding: 5px 10px 5px 10px;
}