关于jquery的mousewheel事件

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最近在做横滚事件，不过用滚轴事件，不过为什么滚动事件会是连续的，求教

		$("body").mousewheel(function(event, delta, deltaX, deltaY){
			var pagepostion =$("#pagepostion").val();
			var waplist=$(".brand_main").length;
			var _h;
			 var marginLeft = (screenWidth - 1000)/2;
			if(delta<0){
				if(pagepostion>=0){
					if(pagepostion==waplist-1){
						return;
					}
					pagepostion++;
					$("#pagepostion").val(pagepostion);
					
				}
				_h="#b"+$("#pagepostion").val();
				$("html,body").animate({ 'scrollLeft' : $(_h).offset().left - marginLeft },1000,"circEaseOut",function(){
					return false;
				});
				
				
			}else{
				if(pagepostion<=waplist-1){
					if(pagepostion==0){
						return;
					}
					pagepostion--;
					$("#pagepostion").val(pagepostion);
					
				}
				_h="#b"+$("#pagepostion").val();
				$("html,body").animate({ 'scrollLeft' : $(_h).offset().left - marginLeft },1000,"circEaseOut",function(){
					return false;
				});
				
			}
			 event.stopPropagation();
             event.preventDefault();
             return false;
			});

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顶