Here you go, http://jsfiddle.net/1j2zxvth/1/

<table align="center" id="tblData" border="1" style="cursor: pointer;">
   <tr>
       <td>R1C1</td>
       <td>R1C2</td>
       <td>R1C3</td>
    </tr>
    <tr>
        <td>R2C1</td>
        <td>R2C2</td>
        <td>R2C3</td>
    </tr>
    <tr>
        <td>R3C1</td>
        <td>R3C2</td>
        <td>R3C3</td>
    </tr>
    <tr>
        <td>R4C1</td>
        <td>R4C2</td>
        <td>R4C3</td>
    </tr>
    <tr>
        <td>R5C1</td>
        <td>R5C2</td>
        <td>R5C3</td>
    </tr>
</table>

<script>
var tbl = document.getElementById("tblData");
if (tbl != null) {
var c = tbl.rows[2].cells[1];
tbl.rows[0].cells[0].onclick = function() {getval(c);};
}

function getval(e) {
    var index_row = e.parentNode.rowIndex;
    var index_cell = e.cellIndex;
    if (index_row !== null && index_cell !== null){
        // did user click 1st column?
        if (index_cell == 0)
            // grab value of 2nd column of clicked row
            var cell_val = tbl.rows[index_row].cells[1].innerHTML;
            alert(cell_val);
    }
}
</script>