Focus() and Move position Focus() into center screen

if($("#intPrice").val() == ""){
        alert("Choose Price");
        $("#price_r").focus();
            jQuery.fn.extend({
            scrollToMe: function () {
            var x = jQuery(this).offset().top - 400;
            jQuery('html,body').animate({scrollTop: x}, 500);
            }});
            $('#price_r').scrollToMe();
        return false;
    }