text: /**
   * @desc 兼容不同的浏览器居中scrollCenter
   * @author ZhangHuihua@msn.com
   */
  (function($){
  	$.fn.extend({
  
  		getWindowSize: function(){
  			if ($.browser.opera) { return { width: window.innerWidth, height: window.innerHeight }; }
  			return { width: $(window).width(), height: $(window).height() };
  		},
  		/**
  		 * @param options
  		 */		
  		scrollCenter: function(options){
  			// 扩展参数
  			var op = $.extend({ z: 1000000, mode:"WH"}, options);
  			
  			// 追加到 document.body 并设置其样式
  			var windowSize = this.getWindowSize();
  
  			if (op.mode == "W") {
  				this.appendTo(document.body).css({
  					'left': (windowSize.width - this.width()) / 2 + $(window).scrollLeft() + 'px'
  				});
  			} else if (op.model == "H"){
  				this.appendTo(document.body).css({
  					'top': (windowSize.height - this.height()) / 2 + $(window).scrollTop() + 'px'
  				});	
  			} else {
  				this.appendTo(document.body).css({
  				//	'position': 'absolute',
  				//	'z-index': op.z,
  					'top': (windowSize.height - this.height()) / 2 + $(window).scrollTop() + 'px',
  					'left': (windowSize.width - this.width()) / 2 + $(window).scrollLeft() + 'px'
  				});
  			}
  
  			
  			// 保存当前位置参数
  			var bodyScrollTop = $(document).scrollTop();
  			var bodyScrollLeft = $(document).scrollLeft();
  			var movedivTop = this.offset().top;
  			var movedivLeft = this.offset().left;
  			
  			var thisjQuery = this;
  			
  			// 滚动事件
  			$(window).scroll(function(e){
  				var windowSize = thisjQuery.getWindowSize();
  				var tmpBodyScrollTop = $(document).scrollTop();
  				var tmpBodyScrollLeft = $(document).scrollLeft();
  				
  				movedivTop += tmpBodyScrollTop - bodyScrollTop;
  				movedivLeft += tmpBodyScrollLeft - bodyScrollLeft;
  				bodyScrollTop = tmpBodyScrollTop;
  				bodyScrollLeft = tmpBodyScrollLeft;
  
  				// 以动画方式进行移动
  				if (op.mode == "W") {
  					thisjQuery.stop().animate({
  						'left': movedivLeft + 'px'
  					});
  				} else if (op.mode == "H") {
  					thisjQuery.stop().animate({
  						'top': movedivTop + 'px'
  					});
  				} else {
  					thisjQuery.stop().animate({
  						'top': movedivTop + 'px',
  						'left': movedivLeft + 'px'
  					});
  				}
  				
  			});
  			
  			// 窗口大小重设事件
  			$(window).resize(function(){
  				var windowSize = thisjQuery.getWindowSize();
  				movedivTop = (windowSize.height - thisjQuery.height()) / 2 + $(document).scrollTop();
  				movedivLeft = (windowSize.width - thisjQuery.width()) / 2 + $(document).scrollLeft();
  				
  				if (op.mode == "W") {
  					thisjQuery.stop().animate({
  						'left': movedivLeft + 'px'
  					});
  				} else if (op.mode == "H") {
  					thisjQuery.stop().animate({
  						'top': movedivTop + 'px'
  					});
  				} else {
  					thisjQuery.stop().animate({
  						'top': movedivTop + 'px',
  						'left': movedivLeft + 'px'
  					});
  				}
  				
  			});
  			
  			return this;
  		}
  	});
  })(jQuery);
  