imgURL  = new Array();
imgURL[0]  = "blog_bg1.css";
imgURL[1]  = "blog_bg2.css";
imgURL[2]  = "blog_bg3.css";
imgURL[3]  = "blog_bg4.css";
imgURL[4]  = "blog_bg5.css";
n = Math.floor(Math.random()*imgURL.length);
document.write("<link href='/css/"+imgURL[n]+"' rel='stylesheet' type='text/css'>");