<table id="t1" onclick="OnStart()">
                <tr>
                    <td> 11 </td>
                    <td> 12 </td>
                </tr>
                <tr>
                    <td> 21 </td>
                    <td> 22 </td>
                </tr>
                <tr>
                    <td> 31 </td>
                    <td> 32 </td>
                </tr>
            </table>

            <script language="javascript" type="text/javascript">
                function OnStart()
                {
                    var TableList = Array();
                    var tr = document.getElementById("t1").getElementsByTagName("tr");
                    for(var i= 0 ;i<tr.length;i++)
                    {
                        var td = tr.item(i).getElementsByTagName("td");
                        for(var j= 0 ;j<td.length;j++)
                        {
                            TableList[i,j] = td.item(j).innerText;
                            alert(td.item(j).innerText);
                        }
                    }                    
                }
            </script>

<script language="javascript" type="text/javascript">
                function OnStart()
                {
                    var TableList = new Array();                    
                    var tr = document.getElementById("t1").getElementsByTagName("tr");
                    for(var i= 0 ;i<tr.length;i++)
                    {
                        var td = tr.item(i).getElementsByTagName("td");
                        TableList[i] = new Array()
                        for(var j= 0 ;j<td.length;j++)
                        {
                            TableList[i][j] = td.item(j).innerText;
                            alert(td.item(j).innerText);
                        }
                    }                    
                }
            </script>