function ocultar(){
    obj = document.getElementById('archivo_mostrado');
	// empty this object of its children
	nodelist = obj.childNodes;
	// now loop and remove them all
	c = nodelist.length;	// needed because changes dynamically
	for(i = 0; i < c; i++)
	{
		this_node = nodelist[0];	// reference changes dynamically
		removed_node = obj.removeChild(this_node);
	}

    if(document.getElementById('archivo_no_mostrado').style.display=='none'){
        document.getElementById('archivo_no_mostrado').style.display = "";
    }
}