function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}
function cambiarLateral(id, newClass) {//para cambiar class del menu lateral
identity=document.getElementById(id);
identity.className=newClass;
}

function cambiarLateral2(id, newClass, id2, newClass2) {//para cambiar class del menu lateral
identity=document.getElementById(id);
identity.className=newClass;
identity=document.getElementById(id2);
identity.className=newClass2;
}