Question

for (var i = 0; row = tableAppointment.rows[i]; i++) {
  for (var j = 0; col = row.cells[j]; j++) {
    //iterate through columns
    //columns would be accessed using the "col" variable assigned in the for loop.
  }
}

How to iterate over each row whose third cell has a rowspan attribute.

Answer 1

This will give you all of the <tr> that have such an element in them:

$('td:nth-child(3)[rowspan]').parent()

demo at http://jsfiddle.net/52aR2/1/