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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);