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    /* 







 * jQuery Fixed Plugins 1.5.1







 * Author:







 * Url:







 * Data







 *







 *  Update Log:







 * 







 *  Status       Date            Name      Version           BUG-Description







 *  ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------







 *  Created      2012-08-15    	 Ru	       1.0               None







 







 *  Modified     2012-09-02      Ru        1.4.1             修复了webkit内核浏览器右边浮动有一定距离的bug(负外边距),增加了悬浮靠边的定位、是否显示关闭按钮、是否垂直居中定位







 







 *  Modified     2013-01-02    	 Ru	       1.5.1             增加了垂直方向的位置;把核心函数(关闭、展开、定位、最小化)重构,修复了webkit内核浏览器右边浮动最小化时没有显示出来







 *  ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------*/















;(function($){







    $.fn.fixed = function(options){







        var defaults = {







			top    			: null,







			halfTop     	: false,







			durationTime 	: 500







        }







        var options = $.extend(defaults, options);		















        this.each(function(){			







           







			var thisBox = $(this),







				contentHeight = thisBox.height(),







				boxTop = null,







				defaultTop = thisBox.offset().top,







				halfTop = ($(window).height() - contentHeight)/2







				;







				







			if(options.top == null){







				boxTop = defaultTop;







			}else {







				boxTop = options.top;







			}







			if( options.halfTop ) {	boxTop = halfTop; }







						







			thisBox.css("top", boxTop);







						







						







			//核心scroll事件			







			$(window).bind("scroll",function(){







				var offsetTop = boxTop + $(window).scrollTop() + "px";







	            thisBox.animate({







					top: offsetTop







	            },{







	            	duration: options.durationTime,	







	                queue: false







	            });







			});







			







				







        });	//end this.each















    };







})(jQuery);