/*<script src="randomimage.js" 
  language="javascript" 
    type="text/javascript"></script>*/

var imagenes = new Array();
	imagenes[0] = "h1.jpg";
	imagenes[1] = "h2.jpg";
        imagenes[2] = "h3.jpg";
        imagenes[3] = "h4.jpg";
	

	document.write('<img src="images/'+imagenes [parseInt(Math.random()*4)]+'" alt="Single Tree Production" />');