title: .innerHTML not working
body: <p>I have a very stupid problem. I would like to change the content of a table cell. My code:</p>
  
  <pre><code>        var x = ajax('...');
  
      alert(x);
      alert(document.getElementById(tdId).innerHTML);
  
      document.getElementById(tdId).innerHTML = x;
  </code></pre>
  
  <p>"x" has the right content => so ajax is working
  And the second alert(...) gives also the right (actual) content. But when I would like to write x in the cell, nothing happens. No error, nothing...</p>
  
  <p>I checked some similar problems here, but without success. </p>
  
  <p>I have a realy no idea, what can I test further to understand the problem. Do you have an idea? Thanks a lot for your help!</p>