jQuery.fn.centerV = function () {
    this.css("position","absolute");
    this.css("top", ( $(window).height() - this.outerHeight(true) ) / 2 + "px");
    return this;
}


$(window).resize(function(){
	
	$('.centerV').each(function() {
		$(this).centerV();
	});   	
	
});


$(window).resize();