เขียนยังครับไม่ให้ select เลือกซ้ำกัน ปล.select มาจากฐานข้อมูล

<script src="http://code.jquery.com/jquery-latest.js"></script>
<script type="text/javascript">
$(document).ready(function(){

	var rows = 1;
	$("#createRows").click(function(){
						var tr = "<tr>";
						tr = tr + "<td align='center'><select name='lang_id"+rows+"' id='lang_id"+rows+"'>";
						tr = tr + "<option select value=''>กรุณาเลือกภาษา</option>";		
						<?php
do {  
?>
						tr = tr + "<option value='<?php echo $row_listlang['lang_id']?>'><?php echo $row_listlang['lang_name']?></option>";
						 <?php
} while ($row_listlang = mysql_fetch_assoc($listlang));
  $rows = mysql_num_rows($listlang);
  if($rows > 0) {
      mysql_data_seek($listlang, 0);
	  $row_listlang = mysql_fetch_assoc($listlang);
  }
?>
						tr = tr + "</select></td>";
						tr = tr + "<td align='center'><input type='radio' name='skill_listen"+rows+"' id='skill_listen"+rows+"' value='ดี'></td>";
						tr = tr + "<td align='center'><input type='radio' name='skill_listen"+rows+"' id='skill_listen"+rows+"' value='พอใช้'></td>";
						tr = tr + "<td align='center'><input type='radio' name='skill_listen"+rows+"' id='skill_listen"+rows+"' value='แย่'></td>";
						tr = tr + "<td align='center'><input type='radio' name='skill_speak"+rows+"' id='skill_speak"+rows+"' value='ดี'></td>";
						tr = tr + "<td align='center'><input type='radio' name='skill_speak"+rows+"' id='skill_speak"+rows+"' value='พอใช้'></td>";
						tr = tr + "<td align='center'><input type='radio' name='skill_speak"+rows+"' id='skill_speak"+rows+"' value='แย่'></td>";
						tr = tr + "<td align='center'><input type='radio' name='skill_read"+rows+"' id='skill_read"+rows+"' value='ดี'></td>";
						tr = tr + "<td align='center'><input type='radio' name='skill_read"+rows+"' id='skill_read"+rows+"' value='พอใช้'></td>";
						tr = tr + "<td align='center'><input type='radio' name='skill_read"+rows+"' id='skill_read"+rows+"' value='แย่'></td>";
						tr = tr + "<td align='center'><input type='radio' name='skill_wrtite"+rows+"' id='skill_wrtite"+rows+"' value='ดี'></td>";
						tr = tr + "<td align='center'><input type='radio' name='skill_wrtite"+rows+"' id='skill_wrtite"+rows+"' value='พอใช้'></td>";
						tr = tr + "<td align='center'><input type='radio' name='skill_wrtite"+rows+"' id='skill_wrtite"+rows+"' value='แย่'></td>";
						tr = tr + "</tr>";
						$('#myTable > tbody:last').append(tr);
					
						$('#hdnCount').val(rows);
						rows = rows + 1;
		});

		$("#deleteRows").click(function(){
				if ($("#myTable tr").length != 1) {
					 $("#myTable tr:last").remove();
				}
		});	
	});
</script>