ie下怎么获得事件源对象

ie下如何获得事件源对象

    document.body.onclick = function(e){        e = e || window.event;        t = e.target || e.srcElement;        var url = t.href;        load_page(url);    };    window.onload = function(){        load_page(location.href);    };        function load_page(url){        url = url || location.href;        if(url.indexOf('#')>-1){            document.getElementById('mark').style.display = 'block';        }    }

?