var imgs = new Array(); 
var links = new Array();
var imgcnt = 0; var thisimg = 0;

//links[imgcnt] = 'http://www.iem.cfmac.csic.es/departamentos/nuclear/';
//imgs[imgcnt++] = 'imagenes\departamento-1.jpg';

//links[imgcnt] = 'http://www.iem.cfmac.csic.es/departamentos/nuclear/';
imgs[imgcnt++] = 'Pictures\/portada1.jpg';
imgs[imgcnt++] = 'Pictures\/portada2.jpg';
imgs[imgcnt++] = 'Pictures\/portada3.jpg';
imgs[imgcnt++] = 'Pictures\/portada4.jpg';



function rotate() {
 if (document.images) {
   thisimg++;
   if (thisimg >= imgcnt) thisimg = 0;
   document.images["rollimg"].src = imgs[thisimg];
   //document.getElementById("rolllink").href = links[thisimg];
   setTimeout("rotate();",4000);
 }
}

setTimeout("rotate();",4000);