var img_rnd = new Array ("rcs/foto_jg1.jpg", "rcs/foto_jg2.jpg", "rcs/foto_jg3.jpg");
var i = Math.round(2*Math.random());
 
document.write('<a href="biografia.htm" title="Trayectoria art&iacute;stica"><img src="' + img_rnd[i] + '" width="310" height="100" usemap="" border="0"></a>');