function tablemath(divID,method,rangeStr)
{
  var result;
  var div = document.getElementById(divID);
  var table = div.parentNode.parentNode.parentNode;
  var setArray = tmSetToArray(table, rangeStr);
  switch(method)
  {
        case 'sum':
        break;
        case 'avg':
        break;
        default:
                method = 'unknown';
        break;
  }
  eval('result = tm'+method+'(setArray);');
  div.innerHTML = result;
}
function tmSetToArray(table, rangeStr)
{
        //range should be like this x,y:x,y
        var range = rangeStr.split(':');
        var start = range[0].split(',');
        var end = range[1].split(',');
        var startX = start[0];
        var startY = start[1];
        var endX = end[0];
        var endY = end[1];

        var set = new Array();
        for(var x = startX; x<=endX; x++)
        {
                for(var y = startY; y<=endY; y++)
                {
                        set.push(tmParseValue(table.rows[y].cells[x]));
                }
        }
        //alert(set);
        return set;
}

function tmParseValue(cell)
{
    var value = parseInt(cell.innerHTML);
    if (isNaN(value))
    {
      value = 0;
    }
    return value;
}

function tmunknown(setArray)
{
        return 'Error';
}

function tmsum(setArray)
{
        var sum = 0;
        for (var i=0; i<setArray.length; i++)
        {
                sum += setArray[i];
        }
        return sum;
}

function tmavg(setArray)
{
        return tmsum(setArray)/setArray.length;
}