var bgNum = Math.round(Math.random() * 2)

bgSel = new Array(3);
bgSel[0] = "/common/images/header/longhaul_header1.jpg";
bgSel[1] = "/common/images/header/longhaul_header2.jpg";
bgSel[2] = "/common/images/header/longhaul_header3.jpg";

var base = bgSel[bgNum];