img = new Array
img[0] = "./images/bg01.gif";
img[1] = "./images/bg02.gif";
img[2] = "./images/bg03.gif";
img[3] = "./images/bg04.gif";
img[4] = "./images/bg05.gif";
img[5] = "./images/bg06.gif";
img[6] = "./images/bg07.gif";
img[7] = "./images/bg08.gif";
img[8] = "./images/bg09.gif";
img[9] = "./images/bg10.gif";

rnd = Math.floor(Math.random() * img.length);

var imagesName = "url('" + img[rnd] + "')";

document.write('<style type="text/css"><!--#wrapper{background-image: url("'+ img[rnd] +'");}--></style>');