jQuery.fn.center=function(b){var a={vertical:true,horizontal:true};var c=jQuery.extend(a,b);return this.each(function(){var g=$(this).parent();var f=g.css("position");var d=f=="relative"||f=="absolute"||f=="fixed";var h={position:"absolute"};if(c.vertical){var e=(d)?Math.round(g.height()/2):Math.round($(window).height()/2)+$(document).scrollTop();h.top=e-Math.round($(this).height()/2)+"px"}if(c.horizontal){var i=(d)?Math.round(g.width()/2):Math.round($(window).width()/2)+$(document).scrollLeft();h.left=i-Math.round($(this).width()/2)+"px"}$(this).css(h)})};