The reason that the menu is having problems is that the menu include file (CSSMenuWriter/cssmw/menu.php) is being called from pages that exist in different levels of your site structure.
Your menu.php file menu structure is:
<ul class="level-0" id="cssmw">
<li><span><a href="/index.php">Home</a></span></li>
<li class="parent"><span><a href="#">Dienstleistungen</a></span>
<ul class="level-1">
<li><a href="../../dienstleistung/projektmanagement/scb_pm.php">Projektmanagement</a></li>
<li class="parent"><a href="#">Schulung</a>
<ul class="level-2">
<li><a href="../../dienstleistung/schulung/msoffice/scb_office.php">MS Office</a></li>
<li><a href="../../dienstleistung/schulung/mswindows/scb_windows.php">MS Windows</a></li>
<li><a href="../../dienstleistung/schulung/scb_internet/scb_internet.php">Internet</a></li>
</ul>
</li>
<li><a href="../../dienstleistung/support/scb_support.php">Support</a></li>
</ul>
</li>
<li><span><a href="../../location/scb_location.php">Wo wir sind</a></span></li>
<li><span><a href="../../Kontakt/scb_contact_us.php">Kontakt</a></span></li>
<li><span><a href="../../News/scb_news.php">News</a></span></li>
</ul>
so that some links are being rendered with an extra 'dienstleistung' in the path (being relative to the page that contains the include).
Try changing all the links that begin with: ../../ to just the single forward slash: / so that all links begin (are relative to) from the root directory.
i.e:
<ul class="level-0" id="cssmw">
<li><span><a href="/index.php">Home</a></span></li>
<li class="parent"><span><a href="#">Dienstleistungen</a></span>
<ul class="level-1">
<li><a href="/dienstleistung/projektmanagement/scb_pm.php">Projektmanagement</a></li>
<li class="parent"><a href="#">Schulung</a>
<ul class="level-2">
<li><a href="/dienstleistung/schulung/msoffice/scb_office.php">MS Office</a></li>
<li><a href="/dienstleistung/schulung/mswindows/scb_windows.php">MS Windows</a></li>
<li><a href="./dienstleistung/schulung/scb_internet/scb_internet.php">Internet</a></li>
</ul>
</li>
<li><a href="/dienstleistung/support/scb_support.php">Support</a></li>
</ul>
</li>
<li><span><a href="/location/scb_location.php">Wo wir sind</a></span></li>
<li><span><a href="/Kontakt/scb_contact_us.php">Kontakt</a></span></li>
<li><span><a href="/News/scb_news.php">News</a></span></li>
</ul>
As regards the space before the form, In your webassist/forms/fd_brassystucoba_default.css stylesheet (about line 62/63) add a float:left; property to the rule:
Edit: And change the width to 580px:
form.Brassystucoba_Default {
float:left;
width:580px;
}Then in your webassist/forms/fd_brassystucoba_default.css stylesheet (about line 138), change:
width:614px;
to
width:580px;
