title: jQuery table sort with colspan or rowspan
body: <p><strong>Hi</strong></p>
  
  <p>I'm using <strong><em>tablesorter</em></strong> and have problems with sorting tables that contain <strong><em>rowspan</em></strong> in  definition.
  I've read hints here <a href="https://stackoverflow.com/questions/2509690">Grouping Rows with Client Side HTML Table Sorting</a>
  but solution doesn't work when I have different values for rowspan: once is rowspan=3, once 4 - depends on data taken from DB.</p>
  
  <p>Do you have any other plugin that sorts even such non-standard tables or maybe you know how to tune <strong><em>tablesorter</em></strong> so it sorts data properly?</p>
  
  <p>Expected behaviour: when clicked on column, rows "belonging" to rowspan should be sorted within this section only, all the others - in a standard way.</p>
  
  <p><strong>Thanks in advance</strong>,</p>
  
  <p>Zbigniew</p>
  
  <p>Table code example:</p>
  
  <pre><code>&lt;html&gt;
  &lt;body&gt;
    &lt;table id="misint" border=1 width="400px"&gt;
      &lt;thead&gt;
          &lt;tr style="background:yellow"&gt;
              &lt;th&gt;Col1&lt;/th&gt;
              &lt;th&gt;Col2&lt;/th&gt;
              &lt;th&gt;Col3&lt;/th&gt;
          &lt;/tr&gt;
      &lt;/thead&gt;
      &lt;tbody&gt;
          &lt;tr&gt;
            &lt;td rowspan="3"&gt;1-1&lt;/td&gt;
            &lt;td&gt;1-2&lt;/td&gt;
            &lt;td&gt;1-3&lt;/td&gt;
          &lt;/tr&gt;
          &lt;tr&gt;
              &lt;td&gt;2-2&lt;/td&gt;
              &lt;td&gt;2-3&lt;/td&gt;
          &lt;/tr&gt;
          &lt;tr&gt;
              &lt;td&gt;3-2&lt;/td&gt;
              &lt;td&gt;3-3&lt;/td&gt;
          &lt;/tr&gt;
          &lt;tr&gt;
              &lt;td&gt;4-1&lt;/td&gt;
              &lt;td&gt;4-2&lt;/td&gt;
              &lt;td&gt;4-3&lt;/td&gt;
          &lt;/tr&gt;
          &lt;tr&gt;
            &lt;td&gt;5-1&lt;/td&gt;
            &lt;td rowspan="2"&gt;5-2&lt;/td&gt;
            &lt;td&gt;5-3&lt;/td&gt;
          &lt;/tr&gt;
          &lt;tr&gt;
              &lt;td&gt;6-1&lt;/td&gt;
              &lt;td&gt;6-3&lt;/td&gt;
          &lt;/tr&gt;
      &lt;/tbody&gt;
    &lt;/table&gt;
  
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>