<a id="toggleAll" href="#" >Expand/hide additional information. </a>
 <script type="text/javascript">
 
 var abertos = 0;
 var fechados = 0;
 function contador() {
    abertos = 0;
    fechados = 0;
    jQuery(".expand-control").each( function() {
		if (document.getElementById(this.id).children[0].className != "expand-control-icon icon expanded") {
           	fechados++;
        } else {
        	abertos++;
        }
    });
 }
 AJS.toInit(function() {
 
    contador();
	var soma = abertos + fechados;
	$("#toggleAll").html('Expand/hide ' + soma  + ' additional information.');

    AJS.$('#toggleAll').click(function() {
        contador();
        if (abertos >= fechados) {
            jQuery(".expand-control").each(
                function() {
                    if (document.getElementById(this.id).children[0].className == "expand-control-icon icon expanded") {
                        jQuery(this).trigger("click");
                    }
                }
            )
        } else {
            jQuery(".expand-control").each(
                function() {
                    if (document.getElementById(this.id).children[0].className != "expand-control-icon icon expanded") {
                        jQuery(this).trigger("click");
                    }
                }
            )
        }
    });
});
 </script>

It is impossible to remove parent pages from a hierarchy.