Center an element on the Screen with jQuery

[javascript]
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;
}

//Use the above function as:
$(element).center();
[/javascript]

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