img = new Array();
img[0] = "img/bn01.png";
img[1] = "img/bn02.png";
img[2] = "img/bn02.png";
n = Math.floor(Math.random()*img.length);
document.write("<a href='http://www.sido-collection.com/press/'><img src='"+img[n]+"' width='570' height='254' border='0'></a>");