Код:
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>
THIS IS MY HTML
</title>
</head>
<body>

<table 
border="1"
bordercolor="blue">
<tr>
<td>1</td>
<td>2</td>
<td>3</td>
</tr>
<tr>
<td>4</td>
<td>5</td>
<td>6</td>
</tr>
</table>
  
<table
border="1"
bordercolor="blue">
<tr>
<td colspan="3">Шапка
</td>
</tr>
<tr>
<td>Навигация</td>
<td>контент</td>
<td>сторонние ресурсы</td>
</tr>
</table>

<table
border="1"
bordercolor="blue">
<tr>
<td rowspan="3">навигация</td>
<td>шапка</td>
<td rowspan="3">реклама</td>
</tr>
<tr>
<td>шапка</td>
</tr>
<tr>
<td>об авт.</td>
</tr>
</table>

<table
style="width:100%;height:100%"
border="3"
bordercolor="blue">
<tr>
<td>1</td>
<td>2</td>
<td>3</td>
<td>4</td>
<td>5</td>
<td>6</td>
</tr>
<tr>
<td>7</td>
<td rowspan="3" colspan="2">8</td>
<td rowspan="3" colspan="2">9</td>
<td>10</td>
</tr>
<tr>
<td>11</td>
<td>12</td>
</tr>
<tr>
<td>13</td>
<td>14</td>
</tr>
<tr>
<td>15</td>
<td colspan="2">16</td>
<td colspan="2">17</td>
<td>18</td>
</tr>
</table>
 
</body>
</html>