Implementare un plugin per centrare un'immagine nella finestra del browser

Includo i link al javascript

HTML code:

<head>

<script src="jquery-1.2.6.pack.js" type="text/javascript">

<script src="center.jQuery.js" type="text/javascript">

</head>
<script type="text/javascript">

$(function(){

$('img').center();

});

</script>

center.jQuery.js

(function($){

$.fn.center = function(){

var element = this;

$(element).load(function(){

changeCss();

$(window).bind("resize", function(){
    changeCss();
});

function changeCss(){

    var imageHeight = $(element).height();
    var imageWidth = $(element).width();
    var windowWidth = $(window).width();
    var windowHeight = $(window).height();

    $(element).css({
        "position" : "absolute",
        "left" : windowWidth / 2 - imageWidth / 2,
        "top" : windowHeight /2 - imageHeight / 2
    });
};
});

};

})(jQuery);

Sample