Thomas Dose: onmouseover mit der write-Methode

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Ich habe folgenden code geschrieben.
Eine Tabelle wird generiert. Die einzelnen Zellen bekommen eine id. Beim Überfahren mit der Maus soll jede Zelle ihre Farbe ändern.
Die Zuordnung der id funktioniert, was ich mit der alert-Funktion überprüft habe. Der Aufruf der Funktion "Markieren" funktioniert aber überhaupt nicht.
Wer kann helfen?

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
<head>
    <title>Tabelle generieren</title>
    <script type='text/javascript'>

<!--

function LadenMZ() {

document.write('<table border="1" cellpadding="5" cellspacing="0">');

document.write('<tr>');
    document.write('<td id = "Zelle110" onmouseover = "Markieren(1,10)" onmouseout = "Normalisieren(1,10)" onclick = "Aktivitaet(1,10)"><p id = "Raster110">Z110</p></td>');
    document.write('<td id = "Zelle111" onmouseover = "Markieren(1,11)" onmouseout = "Normalisieren(1,11)" onclick = "Aktivitaet(1,11)"><p id = "Raster111">Z111</p></td>');
    document.write('<td id = "Zelle112" onmouseover = "Markieren(1,12)" onmouseout = "Normalisieren(1,12)" onclick = "Aktivitaet(1,12)"><p id = "Raster112">Z112</p></td>');
    document.write('<td id = "Zelle113" onmouseover = "Markieren(1,13)" onmouseout = "Normalisieren(1,13)" onclick = "Aktivitaet(1,13)"><p id = "Raster113">Z113</p></td>');
    document.write('<td id = "Zelle114" onmouseover = "Markieren(1,14)" onmouseout = "Normalisieren(1,14)" onclick = "Aktivitaet(1,14)"><p id = "Raster114">Z114</p></td>');
    document.write('</tr>');

document.write('<tr>');
    document.write('<td id = "Zelle210" onmouseover = "Markieren(2,10)" onmouseout = "Normalisieren(2,10)" onclick = "Aktivitaet(2,10)"><p id = "Raster210">Z210</p></td>');
    document.write('<td id = "Zelle211" onmouseover = "Markieren(2,11)" onmouseout = "Normalisieren(2,11)" onclick = "Aktivitaet(2,11)"><p id = "Raster211">Z211</p></td>');
    document.write('<td id = "Zelle212" onmouseover = "Markieren(2,12)" onmouseout = "Normalisieren(2,12)" onclick = "Aktivitaet(2,12)"><p id = "Raster212">Z212</p></td>');
    document.write('<td id = "Zelle213" onmouseover = "Markieren(2,13)" onmouseout = "Normalisieren(2,13)" onclick = "Aktivitaet(2,13)"><p id = "Raster213">Z213</p></td>');
    document.write('<td id = "Zelle214" onmouseover = "Markieren(2,14)" onmouseout = "Normalisieren(2,14)" onclick = "Aktivitaet(2,14)"><p id = "Raster214">Z214</p></td>');
    document.write('</tr>');

document.write('<tr>');
    document.write('<td id = "Zelle310" onmouseover = "Markieren(3,10)" onmouseout = "Normalisieren(3,10)" onclick = "Aktivitaet(3,10)"><p id = "Raster310">Z310</p></td>');
    document.write('<td id = "Zelle311" onmouseover = "Markieren(3,11)" onmouseout = "Normalisieren(3,11)" onclick = "Aktivitaet(3,11)"><p id = "Raster311">Z311</p></td>');
    document.write('<td id = "Zelle312" onmouseover = "Markieren(3,12)" onmouseout = "Normalisieren(3,12)" onclick = "Aktivitaet(3,12)"><p id = "Raster312">Z312</p></td>');
    document.write('<td id = "Zelle313" onmouseover = "Markieren(3,13)" onmouseout = "Normalisieren(3,13)" onclick = "Aktivitaet(3,13)"><p id = "Raster313">Z313</p></td>');
    document.write('<td id = "Zelle314" onmouseover = "Markieren(3,14)" onmouseout = "Normalisieren(3,14)" onclick = "Aktivitaet(3,14)"><p id = "Raster314">Z314</p></td>');
    document.write('</tr>');

document.write('</table>');

document.close();

var testtext = document.getElementById("Raster314").firstChild.nodeValue;
    alert(testtext);

};

function Markieren(Zeile,Spalte)
    {
document.getElementById("Zelle"+Zeile+Spalte).setAttribute('bgColor','#ffff00');
    };

function Normalisieren(Zeile,Spalte)
    {
document.getElementById("Zelle"+Zeile+Spalte).setAttribute('bgColor','#ffffff');
    };

function Aktivitaet(Zeile,Spalte)
    {
    alert("Zeile: " + Zeile + " Spalte: " + Spalte);
    };

//-->
    </script>
</head>

<body style="background-color:#FFFFFF; padding:5px"
      onload="LadenMZ()">
</body>
</html>