var myMusic=new Array;

myMusic[0]="music/wcbg.mid";
myMusic[1]="music/wish1.mid";
myMusic[2]="music/0022.mid";
myMusic[3]="music/86.mid";
myMusic[4]="music/8404.mid";
myMusic[5]="music/cool.mid";
myMusic[6]="music/IBELIEVE.mid";
myMusic[7]="music/love.mid";
myMusic[8]="music/oth40.mid";

var curIndex=Math.floor(Math.random() * myMusic.length);
var myBgsoundTag='<bgsound src="' + myMusic[curIndex] + ' " loop="-1">';
document.write(myBgsoundTag);