images = new Array(1);

var axel = Math.random() + "";
var num = axel * 1000000000000000000;

images[0] = "<a href = 'http://thebookjam.com'><img src='http://175g.com/dslip/ads/BJ016_title_ad_detention_slip.gif' border = '2' style='image-border:1;' alt='The Book Jam!'></a>";

// images[1] = "<a href = 'http://www.dummy-essentials.blogspot.com '><img src='http://175g.com/dslip/ads/Dummy-Header.jpg' border = '2' style='image-border:1;' alt='Computer Tips!'></a>";

/*images[1] = images[0];

// FastWeb 

images[2] = "<a href = 'http://edu.fastweb.com/v/w_regp/flow/?utm_source=dslip&utm_medium=cpa&utm_campaign=fw&afbb=FW_728x90_scholarships02&utm_content=0'><img src='http://175g.com/dslip/ads/FastWeb/FW_728x90_scholarships02.jpg' border = '2' style='image-border:1;' alt='Fast Web!'></a>";

images[3] = "<a href = 'http://edu.fastweb.com/v/w_regp/flow/?utm_source=dslip&utm_medium=cpa&utm_campaign=fw&afbb=FW_728x90_degree&utm_content=0'><img src='http://175g.com/dslip/ads/FastWeb/FW_728x90_degree.jpg' border = '2' style='image-border:1;' alt='The Apple!'></a>";
*/

index = Math.floor(Math.random() * images.length);

document.write(images[index]);