set rowspan to malti column by jquery in haml

gistfile1.haml

%table
  %tbody
    %tr
      %td.row_span3
      %td.row_span2
      %td.row_span1

:javascript
  $(function(){
    table_rowspan('row_span',3);
  });

  var table_rowspan = function(class_name,col_level,start_row,range_rows){
    if (range_rows < 2 ) return false;
    var col_name = class_name + col_level;
    if (start_row == undefined) start_row = 0;
    if (range_rows == undefined) range_rows = $('.' + col_name).size();
    var current_row = start_row;
    var rest_rows = range_rows;

    do {
      var merged_rows = 1;
      while (merged_rows < rest_rows){
        var check_row = current_row + merged_rows
        if($('.' + col_name + ':eq(' + current_row + ')').children().text() == $('.' + col_name + ':eq(' + check_row + ')').children().text()){
          $('.' + col_name + ':eq(' + check_row + ')').hide();
          merged_rows += 1;
        }else{
          break;
        }   
      };  

      $('.' + col_name + ':eq(' + current_row + ')').attr('rowSpan',merged_rows); 
      if (col_level > 1){
        table_rowspan(class_name,col_level - 1,current_row,merged_rows);
      }
      current_row += merged_rows;
      rest_rows -= merged_rows;
    }while (current_row < start_row + range_rows);
  }