var core = 0;

function initArray() {

this.length = initArray.arguments.length;
  for (var i = 0; i < this.length; i++) {
  this[i] = initArray.arguments[i];
  }
}

link3 = new initArray(
"http://www.oldwestsigns.com/",
"http://www.referralinstitute.com/"
);

image3 = new initArray(
"/sponsorimages/oldwestsignslogo.jpg",
"/sponsorimages/referralinstitutelogo.jpg"
);

text3 = new initArray(
"Old West Signs",
"Referral Institute"
);

var core = (Math.floor(Math.random()*2));
var ranlink  = link3[core];
var ranimage = image3[core];
var rantext  = text3[core];

document.write('<a id="bannerlink3" href=\"' +ranlink+ '\" target="_blank"><img id="banner3" src=\"'+ranimage+'\" border="0" alt=\"'+rantext+'\"></a>');

function changeImage3() {
var core = (Math.floor(Math.random()*2));
var ranlink  = link3[core];
var ranimage = image3[core];
var rantext  = text3[core];

document.getElementById('bannerlink3').href = ranlink;
document.getElementById('banner3').src = ranimage;
document.getElementById('banner3').alt = rantext;
setTimeout("changeImage3()", 6000);
}

changeImage3();