CSS Ride SideBar needs to Stay Up top

div id="header"
 ?php include("inc/header.inc"); ?
  h1 Point of Sale for Restaurants, POS Retail and Inventory by Cafe Cartel/h1
/div

div id="sidebar"
 ?php include("inc/sidebar_justafew.inc"); ?
 ?php include("inc/sidebar_whouses.inc"); ?
/div

float: right;
    position: relative;
    left: 178px;
    width: 166px;
    padding-top: 5px;
margin-left: -165px;
margin-bottom: 50px;
    line-height: 1.4em;
    voice-family: ""}"";
    voice-family: inherit;
    width: 165px;
    }

#maincontent {
    margin:0;
    padding:0;
    position:relative;
    width:97%;
    float: left;
}