var max;
var min;
var iNum;
var imgPath;

min = 1;
max = 10;

iNum = Math.floor(Math.random() * (max - min + 1)) + min;

imgPath = "http://www.pc-games-and-reviews.com/images/blog-ad-" + iNum + ".jpg";

document.write("<a href='http://blog.pc-games-and-reviews.com'><img border='0' src='");
document.write(imgPath);
document.write("'/></a>");