function Images(){
this.items=new Array;
this.add=addImages;
this.get=getImages;
}

function addImages(ImagesURL,Href,AltTag){
var rec=new Object;
rec.url=ImagesURL;
rec.href=Href;
rec.alt=AltTag;
<!-- rec.credit=Credit; -->
var itemCount=this.items.length;
this.items[itemCount]=rec;
}

function getImages(){
var itemCount=this.items.length;
var idx=Math.round(Math.random()*(itemCount-1));
var rec=this.items[idx];
var buf='<img border=0 src="' + rec.url + '" alt="' + rec.alt + '">';
//buf+='<div class="caption">' + rec.cap + '&nbsp;<span class="credit">' + rec.credit + '</span></div>';
return buf;
}


// START home page random ads
var randImage=new Images;


// 
randImage.add('http://www.kellogg.northwestern.edu/research/ghi/images/rotating/2.jpg', '', '');

randImage.add('http://www.kellogg.northwestern.edu/research/ghi/images/rotating/3.jpg', '', '');

randImage.add('http://www.kellogg.northwestern.edu/research/ghi/images/rotating/4.jpg', '', '');

randImage.add('http://www.kellogg.northwestern.edu/research/ghi/images/rotating/5.jpg', '', '');





// END home page random ads