function MuestraImagen(url_imagen){
var img = new Image();
img.src = url_imagen;
win=window.open('','','width='+640+',height='+480+',scrollbars=no,resizable=1,toolbar=0');
win.document.write ('\n');
win.document.write (' \n');
win.document.write (' '+ 'La Zarza' +'\n');
win.document.write (' \n');
win.document.write (' \n');
win.document.write (' 
\n');
win.document.write (' \n');
win.document.write ('\n');
}
function ActualizaVentana(){
window.open(document.Formulario.Lista.value,"_self");
}