<table border="1" cellspacing="0" cellpadding="4">
<tr>
       <td>Row 1, Column 1</td>
       <td>Row 1, Column 2</td>
       <td>Row 1, Column 3</td>
</tr>
<tr>
       <td>Row 2, Column 1</td>
       <td>Row 2, Column 2</td>
       <td>Row 2, Column 3</td>
</tr>
<tr>
       <td>Row 3, Column 1</td>
       <td>Row 3, Column 2</td>
       <td>Row 3, Column 3</td>
</tr>
</table>

.cur_row {
color: #000;
background: #FFE3B3;
}

.cur_col {
color: #000;
background: #FFF9B5;
}

.cur_cell {
color: #000;
background: #FDC743;
}

window.onload=function()
{
    init();
}

function init()
{
    var table=document.getElementById('highlight');

    function highlight(row, col, state)
    {
        for(var i=0; i<table.rows.length; i++)
        {
            if(state=='off')
            {
                for(var j=0; j<table.rows[i].cells.length; j++)
                {
                    table.rows[i].cells[j].className='';
                }
            }

            if(state=='on')
            {
                table.rows[i].cells[col].className='cur_col';
            }
        }

        for(var i=0; i<table.rows[row].cells.length; i++)
        {
            if(state=='on')
            {
                table.rows[row].cells[i].className='cur_row';
                table.rows[row].cells[col].className='cur_cell';
            }
        }
    }
    // end function highlight

    // detect cursor position
    for(var i=0; i<table.rows.length; i++)
    {
        table.rows[i].row_index=i;
        for(var j=0; j<table.rows[i].cells.length; j++)
        {
            table.rows[i].cells[j].column_index=j;
            table.rows[i].cells[j].onmouseover=function()
            {
                highlight(this.parentNode.row_index, this.column_index, 'on');
            }
            table.rows[i].cells[j].onmouseout=function()
            {
                highlight(this.parentNode.row_index, this.column_index, 'off');
            }
        }
    }
}