Ciao a tutti. Sto impazzendo!
Ho questo codice HTML, il cui risultato potete vederlo qui:

http://www.lisolachenonce.ws/htmlit

Come vedete, con firefox la seconda cella della seconda riga non va "al suo posto", mentre con internet explorer.... ORRORE! La cella va ancora piu' al centro della pagina!
Cosa sbaglio?

codice:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>IsNotADream.Com</title>
    <style type="text/css">
		
		</style>
</head>
<!--
<body style="background-image: 'images/bg.png';">
-->
<body topmargin="0" leftmargin="0" topmargin="0" bottommargin="0">
    <table cellpadding="0" cellspacing="0" border="0" width="100%">
        <tr>
            <td style="border-collapse: collapse;" width="780px" colspan="2">
                [img]images/header.gif[/img]
                <map name="mapHeader" id="mapHeader">
                    <area shape="rect" coords="540, 215, 360, 290" href="faq.html" alt="" />
                    <area shape="rect" coords="102,40,325,84" href="index.html" alt="" />
                </map>
            </td>
            <td style="border-collapse: collapse;" background="images/header_bg.gif" colspan="1">
            </td>
        </tr>
        <tr>
            <td style="border-collapse: collapse; background-color: White;" width="406px" colspan="1"
                align="center" valign="middle">
                <object>
                    <param name="allowFullScreen" value="true" />
                    <embed src="http://www.youtube.com/v/u2rAg6YlRtM&hl=it&fs=1" type="application/x-shockwave-flash"
                        allowscriptaccess="always" allowfullscreen="true" width="425" height="344" />
                </object>
            </td>
            <td style="border-collapse: collapse;" width="294px" colspan="1">
                [img]images/right.gif[/img]
                <map name="mapRight" id="mapRight">
                    <area shape="rect" coords="80,319,239,342" href="iscrizione.html" alt="" />
                </map>
            </td>
            <td style="border-collapse: collapse; background-color: White;" colspan="1">
            </td>
        </tr>
        <tr>
            <td style="border-collapse: collapse;" width="780px" colspan="2">
                [img]images/footer.gif[/img]
                <map name="mapFooter" id="mapFooter">
                    <area shape="rect" coords="272,12,304,22" href="index.html" alt="" />
                    <area shape="rect" coords="337,12,395,22" href="supporto.html" alt="" />
                    <area shape="rect" coords="429,12,449,22" href="faq.html" alt="" />
                    <area shape="rect" coords="479,12,550,22" href="mailto:info@isnotadream.com" alt="" />
                </map>
            </td>
            <td style="border-collapse: collapse;" background="images/altre_bg_footer.gif" colspan="1">
            </td>
        </tr>
    </table>
</body>
</html>