// JavaScript Document
var myImg = new Array("images/news_01.jpg","images/news_02.jpg","images/news_03.jpg");
var myMap = new Array("news_01","news_02","news_03");

function showImg(){ 
	var imgIndex = Math.floor(Math.random()*myImg.length); 
	document.getElementById("my_div").innerHTML  = "<img src='"+myImg[imgIndex]+"' usemap='#"+myMap[imgIndex]+"'>"; 
}