function random_banner() {
banner = new Array();
banner[0]="banner4.gif";
message = new Array();
message[0]="Hearty Music School";
link = new Array();
link[0] = "http://www.heartyinc.com/school";
rand = Math.floor(Math.random()*banner.length);
document.write("<p><a target='_blank' href="+link[rand]+"><img alt="+message[rand]+" src="+banner[rand]+" style='border-style:none'></a></p>");
}