Center an element on the screen using jQuery

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;

}

 This is how you use it:  $('#window').center();

The above method will show the control @ center of the Window.