var AbstractMap={};AbstractMap.Events={getWheelEventDirection:function(event){var delta=0;if(!event){event=window.event;}if(event.wheelDelta){delta=event.wheelDelta/120;if(window.opera){delta= -delta;}}else if(event.detail){delta= -event.detail/3;}if(event.preventDefault){event.preventDefault();}event.returnValue=false;return(delta<0)?1: -1;}};