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<html lang="en">
  <head>    
    <script>
    function btnClick() {
    var x = document.getElementById("mytable").getElementsByTagName();
      
  
  x[0].style.backgroundColor ="#000000"; 
   x[0].Color =""; 
  x[0].style.backgroundColor ="yellow";
  
  
}
    </script>
</head>
    <style>
    div
    {
    text-align: left; 
    text-indent: 0px; 
    padding: 0px 0px 0px 0px; 
    margin: 0px 0px 0px 0px;
    }
    td.td
    {
                 border-width : 0px; 
                 
                 text-align:center;
    }
    table#mytable1.td
    {
                 border-width : 0px; 
                 
                 text-align:center;
    }
    </style>  
  <body>
  <div>  
    <table id = "mytable" width="100%" border="1" cellpadding="2" cellspacing="2" style="border-collapse:collapse;">
      <tr valign="top">
      <td id= 'xxxx1' class = "td"><br />  </td>
      <td class = "td"><br />  </td>
      </tr>
      <tr valign="top">
      <td class = "td"><br />  </td>
      <td class = "td"><br />  </td>
      </tr>
    </table>
    <table id = "mytable1" width="100%" border="1" cellpadding="2" cellspacing="2" style="border-collapse:collapse;">
      <tr valign="top">
      <td class = ""><br />  </td>
      <td class = "td"><br />  </td>
      </tr>
      <tr valign="top">
      <td class = "td"><br />  </td>
      <td class = "td"><br />  </td>
      </tr>
    </table>
  </div>
      <input type="button" value="Click" OnClick = "btnClick(1)">
  </body>
</html>
 
function btnClick(nr) {
    
  var erik = "xxxx"+nr;
  alert(erik);
  document.getElementById(erik).style.backgroundColor ="red";
  
}
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anonymouspro
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