//获取当前鼠标位置
function mousePosition(ev) {
    //Firefox 和其他浏览器
    if (ev.pageX || ev.pageY) {
        return { x: ev.pageX, y: ev.pageY };
    }
    //MSIE
    return {
        x: ev.clientX + document.body.scrollLeft + document.documentElement.scrollLeft,
        y: ev.clientY + document.body.scrollTop + document.documentElement.scrollTop
    };
}

//获取浏览器事件，同时兼容ie和ff的写法
function getEvent() {
    if (document.all) return window.event;
    func = getEvent.caller;
    while (func != null) {
        var arg0 = func.arguments[0];
        if (arg0) {
            if ((arg0.constructor == Event || arg0.constructor == MouseEvent) || (typeof (arg0) == "object" && arg0.preventDefault && arg0.stopPropagation)) {
                return arg0;
            }
        }
        func = func.caller;
    }
    return null;
}