if (document.getElementById("membertable")) {
  var row = document.getElementById("membertable").rows;
  var rC = row.length;
  var tBody = row[0].parentNode;
  for(i=0;i<rC;i++){
    tBody.insertBefore(row[Math.ceil(Math.random()*(rC-1))],row[i]);
  }
}