<asp:TextBox ID="txtBorderColor" runat="server" onfocus="showColorSelector(this);"></asp:TextBox>

    function showColorSelector(colorTextBox) {
        currentColorTextBox = colorTextBox;
        show(colorSelector);
        setAbsolutePosRight(colorSelector, colorTextBox);
        document.body.attachEvent("onclick", decideOnOff);
    }
    function decideOnOff() {
        var event = arguments[0] || window.event;
        if (event.clientX + getHScroolPos() < colorSelector.offsetLeft
                || event.clientX + getHScroolPos() > colorSelector.offsetLeft + colorSelector.scrollWidth
                || event.clientY + getVScroolPos() < colorSelector.offsetTop
                || event.clientY + getVScroolPos() > colorSelector.offsetTop + colorSelector.scrollHeight) {

            hide(colorSelector);
            document.body.detachEvent("onclick", decideOnOff);
        }
    }

为什么点击TextBox后，弹出的Div一闪而过，就好像TextBox的onfocus事件之后，紧接着触发了body.onclick事件，而我想要的结果是当TextBox获取焦点后，显示一个Div，我点除TextBox和弹出的Div之外的区域时，Div消失，怎么搞啊？