function fotoAleatoria() {
 var x;
 var t;
 var cad;
 var mes=new Date();
 cad = "fotosportada/imagenes" +mes.getMonth();

 t = 57;
 x = (t-1) * Math.random() + 1;
 x = Math.round(x);
 cad = cad + "/foto" + x + ".jpg";
 return cad;
}

function bannerAleatorio() {
 var q;
 var u;
 var cada;

 u = 5;
 q = (u-1) * Math.random() + 1;
 q = Math.round(q);
 cada = "portada/banner" + q + ".jpg";
 return cada;
}

function showBanner() {
var text = ar[currentMessage]
if (offset < text.length) {
if (text.charAt(offset) == " ")
offset++ 
var partialMessage = text.substring(0, offset + 1) 
window.status = partialMessage
offset++ // IE sometimes has trouble with "++offset"
timerID = setTimeout("showBanner()", speed)
bannerRunning = true
} else {
offset = 0
currentMessage++
if (currentMessage == ar.length)
currentMessage = 0
timerID = setTimeout("showBanner()", pause)
bannerRunning = true
}
}

function stopBanner() {
if (bannerRunning)
clearTimeout(timerID)
bannerRunning = false
}
function startBanner() {
stopBanner()
showBanner()
}