var core = 0;

function initArray() {

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

link1 = new initArray(
"http://www.avocalon.com/",
"http://www.bni.com/",
"http://fatatom.com/",
"http://www.midwestballoonrides.com/",
"http://www.oldwestsigns.com/",
"http://www.referralinstitute.com/",
"http://www.smarterflush.com/"
);

image1 = new initArray(
"/sponsorimages/avocalonlogo.jpg",
"/sponsorimages/bnilogo.jpg",
"/sponsorimages/fatatomlogo.jpg",
"/sponsorimages/midwestballoonrideslogo.jpg",
"/sponsorimages/oldwestsignslogo.jpg",
"/sponsorimages/referralinstitutelogo.jpg",
"/sponsorimages/smarterflushlogo.jpg"
);

text1 = new initArray(
"Avocalon",
"BNI",
"Fat Atom Internet Marketing",
"Midwest Balloon Rides",
"Old West Signs",
"Referral Institute",
"Smart Flush"
);

var core = (Math.floor(Math.random()*7));
var ranlink  = link1[core];
var ranimage = image1[core];
var rantext  = text1[core];

document.write('<a id="bannerlink1" href=\"' +ranlink+ '\" target="_blank"><img id="banner1" src=\"'+ranimage+'\" border="0" alt=\"'+rantext+'\"></a>');

function changeImage1() {
var core = (Math.floor(Math.random()*7));
var ranlink  = link1[core];
var ranimage = image1[core];
var rantext  = text1[core];

document.getElementById('bannerlink1').href = ranlink;
document.getElementById('banner1').src = ranimage;
document.getElementById('banner1').alt = rantext;
setTimeout("changeImage1()", 3000);
}

changeImage1();