function setHeader() {
            var option = new Array()
            option[0] = "home1"
            option[1] = "home2"
            option[2] = "home3"
            option[3] = "home4"
            
            var rand = Math.floor(Math.random() * option.length);
            //if (rand == 0) rand = 1;
            document.body.className = option[rand];
        }