function showdropdown(sender)
{
    if(!ie6())
        return true;
    
    var lists = sender.getElementsByTagName('UL');
    lists[0].style.display = "block";
    sender.className = "selected";
    return true;
}

function hidedropdown(e, sender)
{
    if(!ie6())
        return true;
    
    var lists = sender.getElementsByTagName('UL');
    lists[0].style.display = "none";
    sender.className = "";
    return true;
}

function ie6()
{
    var appversion = new String(navigator.appVersion);
    var ieVersion = appversion.indexOf('MSIE');
    if(ieVersion == -1)
        return false; // No IE browser
    var version = parseInt(appversion.substr(ieVersion + 4, 10));
    if(version > 6)
        return false; // IE 7 is ok
        
    return true;
}