public void RemoveChild( 
   HtmlElement child
)

public static int Execute(Instance instance)
{
    instance.ClearCookie();
 
    Tab tab = instance.MainTab;
    if ((tab.IsVoid) || (tab.IsNull)) return -1;
    if (tab.IsBusy) tab.WaitDownloading();
    tab.Navigate("lessons.zennolab.com");
    if (tab.IsBusy) tab.WaitDownloading();
            
    HtmlElement he = tab.FindElementById("main");
            
    HtmlElement heToRemove = tab.FindElementById("inputs");
            
    he.RemoveChild(heToRemove);
            
    return 0;
}

public static function Execute($instance)
{
    $instance->ClearCookie();
 
    $tab = $instance->MainTab;
    if (($tab->IsVoid) || ($tab->IsNull)) return -1;
    if ($tab->IsBusy) $tab.WaitDownloading();
    $tab->Navigate("lessons.zennolab.com");
    if ($tab->IsBusy) $tab->WaitDownloading();
            
    $he = $tab->FindElementById("main");
            
    $heToRemove = $tab->FindElementById("inputs");
            
    $he->RemoveChild($heToRemove);
            
    return 0;
}