Center any div on page (think google.com's search box)

center_div.js

   // $(element).center();
    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;
    }