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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);