var banner= new Array()
banner[0]="images/header1.jpg"
banner[1]="images/header2.jpg"
banner[2]="images/header3.jpg"
banner[3]="images/header4.jpg"
banner[4]="images/header5.jpg"
banner[5]="images/header6.jpg"
var random=Math.floor(6*Math.random());
document.write("<style>");
document.write("#header {");
document.write(' background:url("' + banner[random] + '") no-repeat;');
document.write(" }");
document.write("</style>");