Décalage cellule du tableau et Layout

Bonjour,
Je suis en train de creer des emplois du temps qui doivent etre remplis automatiquement a partir d'un fichier XML. Mais lorsque je veux creer des Layout pour marquer une certaine heure j'ai un probleme de decalage entre cellule du tableau et Layout.
Je vous montre un exemple d'un cours qui commence le lundi a 8h pour une duree de 3 heures.

Pièce jointe 145664

En voici le code:

Code:

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<td width="70" ALIGN="left" height="50" style="border:2px solid white">Lundi</td>
<td style="border-right-style:dotted" width="20">
<div style="position: absolute; width: 286px; height: 54px; z-index: 1;  background-color: #CCCCCC" id="layer1">
</div>
</td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted"  width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted"  width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted"  width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted"  width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td width="92" style="border-right-style:dotted"></td>
<td style="border-right-style:dotted" width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted" width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted" width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted" width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted" width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-right-style:dotted; border-left-style:dotted"  width="20"></td>
<td style="border-left-style:dotted"  width="20"></td>
</tr>

Je vous prie de bien vouloir m'aider.
Merci.