仿QQ2003风格的导航栏

仿QQ2003风格的导航栏(3) }

function Item_MouseOut(obj)
{
    if (obj==null) return;
    obj.style.borderWidth=0;
}

function ScrollButton_MoveTo(obj)
{
    var scroll_btn_up = document.getElementById("scroll_btn_up");
    var scroll_btn_dn = document.getElementById("scroll_btn_dn");
    if (obj==null scroll_btn_up==null scroll_btn_dn==null) return;
    scroll_btn_up.style.pixelLeft = obj.offsetParent.offsetWidth-19;//scroll_btn_up.offsetWidth;
    scroll_btn_up.style.pixelTop = obj.offsetTop+25;//scroll_btn_up.offsetHeight+6;
    scroll_btn_dn.style.pixelLeft = obj.offsetParent.offsetWidth-19;//scroll_btn_up.offsetWidth;
    scroll_btn_dn.style.pixelTop = obj.offsetTop+obj.offsetHeight;
    var client = obj.children[0].children[0];
    if (client.offsetHeight==client.children[0].offsetHeight)
    {
        scroll_btn_up.style.display="none";
        scroll_btn_dn.style.display="none";
    }
    else
    {
        if (client.scrollTop<=0)
            scroll_btn_up.style.display="none";
        else
            scroll_btn_up.style.display="block";
        if (client.offsetHeight+client.scrollTop>=client.children[0].offsetHeight)
            scroll_btn_dn.style.display="none";
        else
            scroll_btn_dn.style.display="block";