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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);