var my_imgs = new Array();
var my_imgs_link = new Array();
var my_imgs_alt = new Array();

/* Set image URLs */
my_imgs[0] = "images/image2.jpg";
my_imgs[1] = "images/image3.jpg";
my_imgs[2] = "images/image4.jpg";
my_imgs[3] = "images/image5.jpg";
my_imgs[4] = "images/image2a.jpg";

/* Set image alternate text */
my_imgs_alt[0] = "PBH";
my_imgs_alt[1] = "PBH";
my_imgs_alt[2] = "PBH";
my_imgs_alt[3] = "PBH";
my_imgs_alt[4] = "PBH";

if (document.getElementById && document.createTextNode) {
 
  var the_div = document.getElementById("my_banners");
  var ran_num = Math.floor(Math.random()*(my_imgs.length));
  
  var the_HTML = "<img src=\""+my_imgs[ran_num]+"\" class=\"banner_imgs\" ";
  the_HTML += "alt=\""+my_imgs_alt[ran_num]+"\" />";
  the_div.innerHTML = the_HTML;
  
}