JSFiddle - React, Tailwind, and code Playground

HTML

<div id="mostrarADS"></div>

JavaScript

//Se crean los array
  	Imagen = new Array();
	Url = new Array(); 

	Imagen[0] = 'http://www.rsc.org/images/011107_Leaderboard_728x90px_2_tcm18-201691.gif';
	Url[0] = 'http://google.com.ar';

	Imagen[1] = 'http://comparegithosting.com/_media/ads728.png';
	Url[1] = 'http://yahoo.com.ar';

	Imagen[2] = 'http://playnstuff.com/wp-content/themes/StartWPA/images/728.png';
	Url[2] = 'http://bing.com.ar';

	//Obtenemos un valor al azar
	var X = Math.floor((Math.random() * Imagen.length));

	document.getElementById("mostrarADS").innerHTML = '<a href="'+ Url[X] +'" target="_blank"><img src="'+ Imagen[X] +'" border="0"></a>';