Esto fue lo que hice, pero no sé cómo ponerle su descripción correspondiente:
<script type="text/javascript">
var imagenes = new armarvector ("http://img.photobucket.com/albums/v30/paspito/LECTURA%20DE%20CARTAS%20ANGELICALES/Mensajes%20Angelitos/021.jpg", "http://img.photobucket.com/albums/v30/paspito/LECTURA%20DE%20CARTAS%20ANGELICALES/Mensajes%20Angelitos/022.jpg","http://img.photobucket.com/albums/v30/paspito/LECTURA%20DE%20CARTAS%20ANGELICALES/Mensajes%20Angelitos/023.jpg", "http://img.photobucket.com/albums/v30/paspito/LECTURA%20DE%20CARTAS%20ANGELICALES/Mensajes%20Angelitos/024.jpg", "http://img.photobucket.com/albums/v30/paspito/LECTURA%20DE%20CARTAS%20ANGELICALES/Mensajes%20Angelitos/025.jpg", "http://img.photobucket.com/albums/v30/paspito/LECTURA%20DE%20CARTAS%20ANGELICALES/Mensajes%20Angelitos/026.jpg", "http://img.photobucket.com/albums/v30/paspito/LECTURA%20DE%20CARTAS%20ANGELICALES/Mensajes%20Angelitos/027.jpg", "http://img.photobucket.com/albums/v30/paspito/LECTURA%20DE%20CARTAS%20ANGELICALES/Mensajes%20Angelitos/028.jpg", "http://img.photobucket.com/albums/v30/paspito/LECTURA%20DE%20CARTAS%20ANGELICALES/Mensajes%20Angelitos/029.jpg", "http://img.photobucket.com/albums/v30/paspito/LECTURA%20DE%20CARTAS%20ANGELICALES/Mensajes%20Angelitos/030.jpg", "http://img.photobucket.com/albums/v30/paspito/LECTURA%20DE%20CARTAS%20ANGELICALES/Mensajes%20Angelitos/031.jpg", "http://img.photobucket.com/albums/v30/paspito/LECTURA%20DE%20CARTAS%20ANGELICALES/Mensajes%20Angelitos/032.jpg", "http://img.photobucket.com/albums/v30/paspito/LECTURA%20DE%20CARTAS%20ANGELICALES/Mensajes%20Angelitos/033.jpg", "http://img.photobucket.com/albums/v30/paspito/LECTURA%20DE%20CARTAS%20ANGELICALES/Mensajes%20Angelitos/034.jpg", "http://img.photobucket.com/albums/v30/paspito/LECTURA%20DE%20CARTAS%20ANGELICALES/Mensajes%20Angelitos/035.jpg", "http://img.photobucket.com/albums/v30/paspito/LECTURA%20DE%20CARTAS%20ANGELICALES/Mensajes%20Angelitos/036.jpg", "http://img.photobucket.com/albums/v30/paspito/LECTURA%20DE%20CARTAS%20ANGELICALES/Mensajes%20Angelitos/037.jpg", "http://img.photobucket.com/albums/v30/paspito/LECTURA%20DE%20CARTAS%20ANGELICALES/Mensajes%20Angelitos/038.jpg", "http://img.photobucket.com/albums/v30/paspito/LECTURA%20DE%20CARTAS%20ANGELICALES/Mensajes%20Angelitos/039.jpg", "http://img.photobucket.com/albums/v30/paspito/LECTURA%20DE%20CARTAS%20ANGELICALES/Mensajes%20Angelitos/040.jpg", "http://img.photobucket.com/albums/v30/paspito/LECTURA%20DE%20CARTAS%20ANGELICALES/Mensajes%20Angelitos/041.jpg", "http://img.photobucket.com/albums/v30/paspito/LECTURA%20DE%20CARTAS%20ANGELICALES/Mensajes%20Angelitos/042.jpg", "http://img.photobucket.com/albums/v30/paspito/LECTURA%20DE%20CARTAS%20ANGELICALES/Mensajes%20Angelitos/043.jpg", "http://img.photobucket.com/albums/v30/paspito/LECTURA%20DE%20CARTAS%20ANGELICALES/Mensajes%20Angelitos/044.jpg");
function Imagen_Aleatoria() {
hoy= new Date();
maximo=24; //La cantidad de imagenes que poseemos.
segundos=hoy.getSeconds();
if (segundos==0) {segundos=1}
while (segundos>maximo) {segundos=segundos-maximo}
document.write ('<img SRC="'+imagenes[segundos]+'" border=0>');
}
function armarvector (v1, v2,v3,v4,v5,v6,v7,v8,v9,v10,v11,v12,v13,v14,v15,v1 6,v17,v18,v19,v20,v21,v22,v23,v24) {
this[1]=v1;
this[2]=v2;
this[3]=v3;
this[4]=v4;
this[5]=v5;
this[6]=v6;
this[7]=v7;
this[8]=v8;
this[9]=v9;
this[10]=v10;
this[11]=v11;
this[12]=v12;
this[13]=v13;
this[14]=v14;
this[15]=v15;
this[16]=v16;
this[17]=v17;
this[18]=v18;
this[19]=v19;
this[20]=v20;
this[21]=v21;
this[22]=v22;
this[23]=v23;
this[24]=v24;
}
</script>
<div align="center">
<script>Imagen_Aleatoria()</script>
</div>