Menu de navigation sous IE

Bonjour,

je suis en train de mettre en place pour des utilisateurs des pages d'entrées de données sous IE7 et je bloque sur un souci de menu de navigation. Je souhaite que celui-ci descende lors du scroll ou passage vers une autre section. Cela semble fonctionner sous Chrome et Firefox mais il ne bouge pas sous IE (même 9).

Voici un code test sur lequel je travaille:
Code:
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<html>
    <body style="padding:0;">
        <div style="position:fixed; width:100%; height:70px; background-color:yellow; padding:5px; top:0px; ">
            test content :D
        </div>
        <table style="font-size:80px;">
            <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
            <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
            <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
                        <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
            <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
            <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
            <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
            <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
            <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
            <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
            <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
                        <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
            <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
            <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
            <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
            <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
            <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
                        <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
            <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
            <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
            <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
            <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
            <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
            <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
            <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
            <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
                        <tr>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
                <td>Lorem Ipsum</td>
            </tr>
 
        </table>
        lorem ipsum
    </div>
    </body>
</html>
Quelqu'un a-t-il déjà rencontré ce problème et comment le résoudre (sans introduction/modification de css si possible)