Topic: SV in a mainMovie, both in the center of the window aligned

As in the example multiple_galleries.fla described I load SimpleViewer into my mainMovie. I use for it the following AS-Code:

function loadGallery (galName) {
    _root.xmlDataPath = galName;
    galerie_container.loadMovie ("viewer.swf");
}
loadGallery ("eventGalerie.xml");

SimpleViewer is loaded thereby correctly into the mc galerie_container. But SimpelViewer is in the center of the window aligned and my mainMovie one can find shifted into the left upper corner of the window. I would like to indicate however the main movie and SimpleViewer both at the same time in the center of the window aligned.

Possibly the integration of Flash into the HTML file is responsible for the error. This looks as follows:

<script type="text/javascript" src="swfobject.js"></script>
      <style type="text/css">
    /* hide from ie on mac */
    html &#123;
        height&#58; 100%;
        overflow&#58; hidden;
    &#125;
    #flashcontent &#123;
    height&#58; 100%;
    width&#58; 100%;
    &#125;
    /* end hide */

    body &#123;
    height&#58; 100%;
    margin&#58; 0;
    padding&#58; 0;
    background-color&#58; #FFFFFF;
    &#125;
      </style>
</head>
<body>
<div id="flashcontent">
</div>
    <script type="text/javascript">
        var so = new SWFObject&#40;"cassis.swf", "Cassis", "100%", "100%", "8", "#FFFFFF"&#41;;
        so.addParam&#40;"scale", "noscale"&#41;;
        so.useExpressInstall&#40;'expressinstall.swf'&#41;;
        so.write&#40;"flashcontent"&#41;;
    </script>

My question is: As I reach it, that both films are indicated at the same time in the center of the window aligned.

Thank you for your assistance