Jquery ui datepicker appears off screen fix

/*e.g. $('.ui-datepicker').center();*/

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1. jQuery.fn.center = function () {  
2.     this.css("position", "absolute");  
3.     this.css("top", (($(window).height() - this.outerHeight()) / 2) + $(window).scrollTop() + "px");  
4.     this.css("left", (($(window).width() - this.outerWidth()) / 2) + $(window).scrollLeft() + "px");  
5.     return this;  
6. }  

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