var banner= new Array()
banner[0]="/site/img/headers/bg_head01.jpg"
banner[1]="/site/img/headers/bg_head02.jpg"
//banner[2]="/site/img/headers/bg_head03.jpg"
banner[2]="/site/img/headers/bg_head04.jpg"
banner[3]="/site/img/headers/bg_head05.jpg"
var random=Math.floor(4*Math.random());
document.write("<style type='text/css'>");
document.write("#header {");
document.write(' background:url("' + banner[random] + '") no-repeat;');
document.write(" }");
document.write("</style>");