var pictures = new Array("/sped/images/1.jpg",
							 "/sped/images/2.jpg", 
							 "/sped/images/3.jpg", 
							 "/sped/images/4.jpg");
    var alternate = 0;
	var alternate1 = 1;
    var timerId;
    function showIcon()
    {
        alternate = (alternate > 2) ? 0 :alternate+1;
        document.getElementById('esspImage').src = pictures[alternate];
        timerId = setTimeout("showIcon()", 5000);
    }