JavaScript - Inserir Linha na Table

/***************************************************************
  Insere nova linha na table
****************************************************************/
function insereLinha()
{
  oTable = $("tb_");
  i = oTable.rows.length;
  oRow = oTable.insertRow(i);

  oCell = oRow.insertCell(0);
  oCell.innerHTML = '''';
  oCell.align = '''';
}