flexpaper滚动的时候禁止浏览器滚动

最近做一个项目，需要使用flexpaper来做pdf在线浏览，但是每当鼠标滚轮在flash部位滚动的时候，整个页面也开始滚动起来，特别是chrome浏览器更是坑爹，花了好半天才找出勉强解决的方法，分享一下代码，如有更好的解决方案，求求给我建议。

var isFF = window.navigator.userAgent.toLowerCase().indexOf('firefox');
            var isChrome = window.navigator.userAgent.indexOf("Chrome");
            var mousewheel=function(event)
            {
                var event = event ? event : window.event;
                var obj = event.srcElement || event.target;
                　　　　　　 
                if(obj.type == "application/x-shockwave-flash" || obj.type == ""){
                     if($FlexPaper().getCurrPage()<$FlexPaper().getTotalPages()+1){
                         if(document.all){
                            event.cancelBubble = true;
                            event.returnValue = false;
                            event.preventDefault();
                            event.stopPropagation();
                        }else if(isChrome>0){
                            document.body.style.overflow="hidden";
                            event.stopPropagation();
                        }else{
                            event.preventDefault();
                            event.stopPropagation();
                        }
                     }
                    
                }
            }

            function onloaded(){
                document.getElementsByTagName('object')[0].focus();
                document.getElementsByTagName('object')[0].onmouseover = function(){
                    this.focus();
                }　　　　　
                if(isFF > 0){
                    document.body.addEventListener("DOMMouseScroll", mousewheel, false);
                }else if(isChrome >0){
                    document.body.style.overflow="hidden";
                    document.getElementsByTagName('object')[0].onmousewheel=mousewheel;
                    document.body.onmousewheel = function(){
                        document.body.style.overflow='auto';
                    }
                    document.body.onclick = function(){
                        document.body.style.overflow='auto';
                    }
                }else{
                    document.body.onmousewheel=mousewheel;
                }


            }

            window.onload = function(){
                    onloaded();
            }