$( 'div#question198 table.question tbody th' ).css({'text-align':'center'});

$( 'div#question198 table.question tbody th' ).css({ 'text-align':'center' });

<script type="text/javascript" charset="utf-8">  
  $(document).ready(function() {
 
    // Get rid of all the widths that the API imposes
    $( 'div#question{QID} table.question col' ).attr('width', '');
    $( 'div#question{QID} table.question thead td' ).attr('width', '');
 
    // Define a width for the question table so we can do so for its children
    // NOTE: Keep this to 95% or less so IE will behave
    $( 'div#question{QID} table.question' ).attr('width', '95%');
 
    // Define the column widths
    // Add or remove columns and adjust widths as necessary but widths should add up to 100%
    // NOTE: Columns must be sequentially numbered starting at 0 - eg, td:eq(0), td:eq(1), td:eq(2).....
    $( 'div#question{QID} table.question tbody th:eq(0)' ).css({ 'width':'20%' }); // Answer text column
    $( 'div#question{QID} table.question tbody td:eq(0)' ).css({ 'width':'25%' }); // First answer column
    $( 'div#question{QID} table.question tbody td:eq(1)' ).css({ 'width':'40%' }); // Second answer column
    $( 'div#question{QID} table.question tbody td:eq(2)' ).css({ 'width':'15%' }); // Third answer column
 
    // Push the text input widths to 95% of their parent containers
    $( 'div#question{QID} table.question input[type="text"]' ).css({ 'width':'95%' });
 
    // Align the answer text - feel free to experiment
    $( 'div#question{QID} table.question tbody th' ).css({'text-align':'center'});
 
  });
</script>

// Align the answer text - feel free to experiment
    $( 'div#question{QID} table.question tbody th' ).css({'text-align':'center'});

<script type="text/javascript" charset="utf-8">
  $(document).ready(function(){
    // Identify this question
    var thisQuestion = $('#question{QID}');
 
    // Assign column-specific classes
    $('table.subquestion-list', thisQuestion).addClass('custom-dropdown-array');
    $('table.subquestion-list tr', thisQuestion).each(function(i) {
      $('> *:gt(0)', this).each(function(i){
        $(this).addClass('column-'+(i+1));
        $(this).attr('data-column', i+1);
      });
    });
 
    // Hide the text inputs in columns 2
    $('.column-2 input[type="text"]', thisQuestion).hide();
 
    // Define the select element (dropdown)
    var select1 = '<select class="inserted-select"> \
              <option value="">-- Please Choose --</option> \
              <option value="Not for profit">Not for profit</option> \
              <option value="Private sector">Private sector</option> \
              <option value="Provincial Government">Provincial Government</option> \
              <option value="Municipal government">Municipal government</option> \
              <option value="Other Source (individual)">Other Source (individual)</option> \
            </select>';
 
    // Insert the select elements into column 2
    $('.answer-item.column-2').append(select1);
 
    // Initial dropdown values in column 2 (if the question has already been answered)
    $('.answer-item.column-2 input[type="text"]').each(function(i){
      if($.trim($(this).val()) != '') {
        $(this).closest('td').find('.inserted-select').val($.trim($(this).val()));
      }
    });
 
    // Hide the text inputs in columns 3
    $('.column-3 input[type="text"]', thisQuestion).hide();
 
    // Define the select element (dropdown)
    var select1 = '<select class="inserted-select"> \
              <option value="">-- Please Choose --</option> \
              <option value="New donor/partner">New donor/partner</option> \
              <option value="Existing donor/partner">Existing donor/partner</option> \
            </select>';
 
    // Insert the select elements into column 3
    $('.answer-item.column-3').append(select1);
 
    // Initial dropdown values in column 3 (if the question has already been answered)
    $('.answer-item.column-3 input[type="text"]').each(function(i){
      if($.trim($(this).val()) != '') {
        $(this).closest('td').find('.inserted-select').val($.trim($(this).val()));
      }
    });
 
    // Hide the text inputs in columns 6
    $('.column-6 input[type="text"]', thisQuestion).hide();
 
    // Define the select element (dropdown)
    var select1 = '<select class="inserted-select"> \
              <option value="">-- Please Choose --</option> \
              <option value="Volunteer time">Volunteer time</option> \
              <option value="Professional services">Professional services</option> \
              <option value="Space / facilities">Space / facilities</option> \
              <option value="Travel">Travel</option> \
              <option value="Equipment / supplies">Equipment / supplies</option> \
              <option value="Other">Other</option> \
            </select>';
 
    // Insert the select elements into column 6
    $('.answer-item.column-6').append(select1);
 
    // Initial dropdown values in column 6 (if the question has already been answered)
    $('.answer-item.column-6 input[type="text"]').each(function(i){
      if($.trim($(this).val()) != '') {
        $(this).closest('td').find('.inserted-select').val($.trim($(this).val()));
      }
    });
 
 
    // Hide the text inputs in columns 7
    $('.column-7 input[type="text"]', thisQuestion).hide();
 
    // Define the select element (dropdown)
    var select1 = '<select class="inserted-select"> \
              <option value="">-- Please Choose --</option> \
              <option value="Agreement holder">Agreement Holder</option> \
              <option value="Sub-agreement holder">Sub-Agreement Holder</option> \
              <option value="Sub-sub-agreement holder">Sub-Sub-Agreement Holder</option> \
            </select>';
 
    // Insert the select elements into column 7
    $('.answer-item.column-7').append(select1);
 
    // Initial dropdown values in column 7 (if the question has already been answered)
    $('.answer-item.column-7 input[type="text"]').each(function(i){
      if($.trim($(this).val()) != '') {
        $(this).closest('td').find('.inserted-select').val($.trim($(this).val()));
      }
    });
 
    // Listener on the dropdowns (insert selected values into hidden text input)
    $('.inserted-select').change(function() {
      var thisInput = $(this).closest('td').find('input[type="text"]');
      $(thisInput).val($(this).val());
      checkconditions($(thisInput).val(), $(thisInput).attr('name'), 'text');
    });
 
    // Remove existing column widths
    $('table.subquestion-list col:not(.col-hidden)', thisQuestion).css('width', '');
  });
</script>