function ImagenesObj() {
n=0;
this[n++]="mail.gif";
this[n++]="mail1.gif";
this[n++]="mail2.gif";
this[n++]="mail5.gif";
this[n++]="mail6.gif";
this[n++]="mail7.gif";
this[n++]="mail8.gif";
this[n++]="mail9.gif";
this[n++]="mail10.gif";
this[n++]="mail11.gif";
this[n++]="mail12.gif";
this[n++]="mail13.gif";
this[n++]="mail14.gif";
this[n++]="mail15.gif";
this[n++]="mail16.gif";
this[n++]="mail17.gif";
this[n++]="mail18.gif";
this[n++]="mail19.gif";
this[n++]="mail20.gif";
this[n++]="mail21.gif";
this[n++]="mail22.gif";
this[n++]="mail23.gif";
this[n++]="mail24.gif";
this[n++]="mail25.gif";
this[n++]="mail26.gif";
this[n++]="mail27.gif";
this.N=n;
}

var Imagenes=new ImagenesObj();
src= Imagenes[ Math.floor(Math.random() * Imagenes.N) ];
document.write("<img border=0 src=\"imagenes/" + src + "\">");