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    copied!<p>I used this javascript function once to join/combine all rows, vertically adjacent, with the same value:</p> <pre><code>&lt;script&gt; function joinRows() { var table = document.getElementById("myTable"); for (var i = table.rows.length-1; i&gt;=0; i--) { row = table.rows[i]; for (var j = row.cells.length-1; j&gt;=0 ; j--) { col = row.cells[j]; if(col.innerHTML==table.rows[i-1].cells[j].innerHTML) { var addRows = table.rows[i].cells[j].rowSpan; table.rows[i].deleteCell(j); table.rows[i-1].cells[j].rowSpan = table.rows[i-1].cells[j].rowSpan + addRows; } } } } &lt;/script&gt; </code></pre> <p>The html code below to test it:</p> <pre><code>&lt;table id="myTable" border="1"&gt; &lt;tr&gt; &lt;td id="td.1.1"&gt;1.1&lt;/td&gt; &lt;td id="td.1.2"&gt;2.2&lt;/td&gt; &lt;td id="td.1.3"&gt;1.3&lt;/td&gt; &lt;td id="td.1.3"&gt;1.4&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td id="td.2.1"&gt;1.1&lt;/td&gt; &lt;td id="td.2.2"&gt;2.2&lt;/td&gt; &lt;td id="td.2.3"&gt;2.3&lt;/td&gt; &lt;td id="td.1.3"&gt;2.4&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td id="td.2.1"&gt;1.1&lt;/td&gt; &lt;td id="td.2.2"&gt;3.2&lt;/td&gt; &lt;td id="td.2.3"&gt;2.3&lt;/td&gt; &lt;td id="td.2.3"&gt;3.4&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td id="td.2.1"&gt;4.1&lt;/td&gt; &lt;td id="td.2.2"&gt;4.2&lt;/td&gt; &lt;td id="td.2.3"&gt;4.3&lt;/td&gt; &lt;td id="td.2.3"&gt;4.4&lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;script&gt; //joinRows(); &lt;/script&gt; &lt;br&gt; &lt;button type="button" onclick="joinRows()"&gt;join cells&lt;/button&gt; </code></pre>
 

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