function Pix(){ //constructor
this.items=new Array;
this.add=addPix;
this.get=getPix;
}

function addPix(pixURL,pixCaption){ //method to add record
var rec=new Object;
rec.url=pixURL;
rec.cap=pixCaption;
var itemCount=this.items.length;
this.items[itemCount]=rec;
}

function getPix(){ //method to get record
var itemCount=this.items.length;
var idx=Math.round(Math.random()*(itemCount-1));
var rec=this.items[idx];
var buf='<img src="' + rec.url + '" alt="">';
buf+='<div><p class="caption"><strong>' + rec.cap + '</strong></p></div>';
return buf;
}

var potd=new Pix; //create your list
potd.add('pod1.jpg','View across Wenshan  with Mr Xu&rsquo;s pouchong tea bushes in the foreground');
potd.add('pod2.jpg','View down to Mr  Xu&rsquo;s terraced tea farm high in Wenshan, Taiwan');
potd.add('pod3.jpg','View across to the steep terraces of Mr Xu&rsquo;s pouchong tea farm');
potd.add('pod4.jpg','Mr Xu in the pink hat and his professional tea pickers in Wenshan, Taiwan');
potd.add('pod5.jpg','Mr Xu&rsquo;s high, steep-sided terraces up close');