function boxEqualHeights(selector){
	var maxHeight = 0;
	selector.css("min-height", 0).each(function() {
		var elHeight = $(this).height();
		if(elHeight > maxHeight) maxHeight = elHeight;
	});
	selector.css("min-height", maxHeight);
}

function boxEqualHeightsMargin(selector){
	var maxHeight = 0;
	selector.each(function() {
		var elHeight = $(this).height();
		if(elHeight > maxHeight) maxHeight = elHeight;
	});
        selector.each(function() {
		var elHeight = $(this).height();
		var margen =(maxHeight-elHeight)/2;
		$(this).css({"margin-bottom":margen,"margin-top":margen});
	});
	
}