img_a = new Image();
img_p = new Image();
img_a.src = "/img/pointer_.png";
img_p.src = "/img/pointer2.png";
function ShowHide(id, img) {
	if (Element.visible('s_'+id)) {
		Element.hide('s_'+id); 
		img.src = img_p.src;
	}
	else {
		Element.show('s_'+id)
		img.src = img_a.src;
}	}