var scrollHandler;function ScrollHandler(handleWheel){scrollHandler=this;this.handleWheel=handleWheel;if(window.addEventListener){window.addEventListener("DOMMouseScroll",wheelHandler,false);}window.onmousewheel=document.onmousewheel=wheelHandler;return this;}function wheelHandler(event){var delta=0;if(!event){event=window.event;}if(event.wheelDelta){delta=event.wheelDelta/120;}else{if(event.detail){delta=-event.detail/3;}}if(delta!=0&&scrollHandler.handleWheel){scrollHandler.handleWheel(delta>0?1:-1);}if(event.preventDefault){event.preventDefault();}event.returnValue=false;}