var currentSelected = "element_2";
function changePicture(id){
	var grande = $(id).getAttribute('data-grande');
	var galeria = $(id).getAttribute('data-galeria');
	$('galeria_imagen_principal').innerHTML = "<img src='"+imgUrl+'galeria/'+galeria+"/"+grande+"'/>";
	YAHOO.util.Dom.addClass(id, "selected");
	YAHOO.util.Dom.removeClass(currentSelected, 'selected');
	currentSelected = id;
}