...
<tr class="first">
     <td><input type="checkbox" name="01" /></td>
     <td><span> 000001 </span></td>
</tr>	
<tr class="second">
    <td><input type="checkbox" name="02" /></td>
    <td><span> 000002 </span></td>
</tr>
...

	function select_all()
	{
		var head_select = document.getElementsById('headselect');//это верхний чекбокс
		var val = '';
		if(head_select.checked=='')
			val = 'checked';
		else
			val = '';
		var elems = document.getElementsByName('galka');
		for(var i =  0 ;i< elems.length;i++)
		{
			elems[i].checked = val;
		}
	}

	function select_all()
	{
		var head_select = document.getElementById('headselect');
		
		var elems = document.getElementsByName('galka');
		for(var i =  0 ;i< elems.length;i++)
		{
			elems[i].checked = head_select.checked;
		}
	}

function getClients()
	{
      var elems = document.getElementsByName('galka');
      var clients = '';
      for(var i =  1 ;i< elems.length;i++)
		  {
          if(elems[i].checked)
            {
             clients=clients+elems[i].id+'*';
            }
		  }
		  alert(clients);
		  document.getElementById('array_clients').value = clients;//результат в хидден  
	}

<?
if($_POST)
{
  echo 'We get this string :'.$_POST['array_clients'];
}
?>
<input type = "checkbox" name = "galka" id="1" value = "checked" />
<input type = "checkbox" name = "galka" id="2" value = "checked" />
<input type = "checkbox" name = "galka" id="3" value = "checked" />
<input type = "checkbox" name = "galka" id="4" value = "checked" />
<input type = "checkbox" name = "galka" id="5" value = "checked" />

<form action="" method="post" id="frm1" name="frm1" onSubmit="getClients();">
с отмеченными:
<select size="1" name="todo" onChange = "document.forms.frm1.submit()">
    		<option value="delete">Удалить</option>
    		<option value="block">Заблокировать</option>
    		<option value="unblock">Разблокировать</option>
</select>
<input type="hidden" value="" name="array_clients" id="array_clients">
</form>

<script type="text/javascript">
	function getClients()
	{
      var elems = document.getElementsByName('galka');
      var clients = '';
      for(var i =  1 ;i< elems.length;i++)
		  {
          if(elems[i].checked)
            {
              clients=clients+elems[i].id+'*';
            }
		  }
		  alert(clients);
		  document.getElementById('array_clients').value = clients;  
	}
</script>

<select size="1" name="todo" onChange = "document.forms.frm1.submit()">

<select size="1" name="todo" onChange = "with(document.forms.frm1){onsubmit();submit();}">