ถ้าต้องทำ chekbox หน้า listmenu เพื่อที่จะ checkall ค่าทั้งหมดที่อยู่ใน list จะค้องเขียนโค๊ตยังงัยคะ

<script language="JavaScript">
<!--
function check_uncheck_all(checkname, field)
{
	for (i = 0; i < checkname.length; i++) {
		checkname[i].checked = field.checked? true:false
	}
} 
function collect(cbEl,txEl){
        var s=[];
        var idx=0;
        for(var i=0;i<cbEl.length;i++){
            if (cbEl[i].checked){
                s.push(cbEl[i].value);
            }
        }
        txEl.value=s.join('\n');
    }
</script>
<form name="form1" method="post" action="">
  <p align="center"><font size="2" face="Tahoma"> </font></p>
  <table width="51%" border="1" align="center" cellpadding="0" cellspacing="0">
    <tr> 
      <td><font size="2" face="Tahoma">   
        <input name="all1[]" type="checkbox" id="chk_all1[]" onClick="collect(this.form.all1,this.form.species)" class="all1-default" />
        <font color="#1780D5"> All fishes</font></font></td>
      <td><font color="#1780D5"> <font size="2" face="Tahoma"> 
        <select name="select" id='select43'>
		<option VALUE="Catfish">Catfish</option>
		<option VALUE="Gobi">Gobi</option> 
		<option VALUE="Scard">Scard</option>
		<option VALUE="Tuna">Tuna</option>
		<option VALUE="Mackerel">Mackerel</option>
        </select>
        </font></font></td>
      <td><font size="2" face="Tahoma">
        <input type="button" name="Button22" value=" + "  onClick="document.getElementById('species').value=document.getElementById('species').value+'\n'+document.getElementById('select').value;">
        </font></td>
    </tr>
    <tr> 
      <td width="25%" height="26"><font size="2" face="Tahoma"> 
        <input name="all2[]" type="checkbox" id="all2[]" onclick="collect(this.form.all2,this.form.species)" class="all2-default" />
        <font size="2" face="Tahoma" color="#1780D5"> All crustaceans</font> </font></td>
      <td width="38%"><font size="2" face="Tahoma">
		<select name="select2" id='select38'>
		<option VALUE="Swimming crab">Swimming crab</option>
		<option VALUE="Mangrove crab">Mangrove crab</option> 
		<option VALUE="Tiger prawn">Tiger prawn</option>
		<option VALUE="Spiny lobster">Spiny lobster</option>
		<option VALUE="Slipper lobster">Slipper lobster</option>
        </select>
        &nbsp; </font></td>
      <td width="37%"><font size="2" face="Tahoma">
        <input type="button" name="Button32" value=" + "  onClick="document.getElementById('species').value=document.getElementById('species').value+'\n'+document.getElementById('select2').value;">
        </font></td>
    </tr>
  </table>
  <p align="center"><font color="#1780D5" size="2" face="Tahoma"></font> </p>
  <p align="center"> 
    <textarea name="species" cols="45" rows="5" readonly="readonly" wrap="PHYSICAL" id="species">List of Species </textarea>
  </p>
  <p align="center"> 
    <input type="submit" name="Submit" value="Submit">
    &nbsp; &nbsp; 
    <input type="reset" name="Submit2" value="Reset">
    <br />
  </p>
<p align="center">&nbsp;</p>
</form>