javasctipt: #table, #clone-header

gistfile1

$(document).ready(function() {
  TABLE.repeatHeader('#celebs', 10)
});

var TABLE = {};

TABLE.repeatHeader = function(table, every){
  $(table).each(function() {
    var $this = $(this);
    var rowsLen = $this.find('tr:not(:first)').length;
    
    $(this).find('tr:first')
      .clone()
      .insertAfter($this.find('tr:nth-child(' + every + 'n)'));
    
    if((rowsLen) % every === 0 ) {
      $this.find('tr:last').remove();
    }
  });
}