// JavaScript Document

var bgStyles = Array("url('images/title1.jpg') no-repeat;", "url('images/title2.jpg') no-repeat;", "url('images/title3.jpg') no-repeat;", "url('images/title6.jpg') no-repeat;", "url('images/title7.jpg') no-repeat;", "url('images/title9.jpg') no-repeat;", "url('images/title8.jpg') no-repeat;");

var index = Math.floor(Math.random() * bgStyles.length);

document.getElementById("mainimage").style.background = bgStyles[index];