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function setCenter( ele ) {
    var l = Math.floor(($(window).width() - $(ele).width()) / 2);
    var t = Math.floor(($(window).height() - $(ele).height()) / 2);
 
    $(ele).css({
        "top": t,
        "left": l
    });
}
 
setCenter(".dialog");
 
$(window).resize(function(){
    setCenter(".dialog");
});

jQuery.fn.center = function () {
    this.css("position","absolute");
    this.css("top", ( $(window).height() - this.height() ) / 2+$(window).scrollTop() + "px");
    this.css("left", ( $(window).width() - this.width() ) / 2+$(window).scrollLeft() + "px");
    return this;
    };
$("#ww10101").center();