If Checkbox checked, only allow the next Checkbox to check

I make a Table with php function

<table width='400' border='0' cellpadding='2' cellspacing='0' id='booking'>
<tr>
    <th width='150' align='left'>Start</th>
    <th width='150' align='left'>End</th>
    <th width='150' align='left'></th>
    <th width='20' align='left'>reserv</th>         
</tr>
<tr>
    <td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td>
</tr>

At the end i make td's with times and dates. in the last is one checkbox. This i make 10 times.

        <tr>
            <td>" . $start . "</td>\r\n
            <td>" . date("H:i:s", $finish_time) . "</td>\r\n
            <td>" . $this->cost_currency_tag . number_format($this->cost_per_slot, 2) . "
        </td>
        <td width='110'>
            <input data-val='" . $start . " - " . 
            date("H:i:s", $finish_time) . "' class='fields' type='checkbox'>
        </td>
     </tr>";

I will make when i check a checkbox jquery allow only to check the NEXT checkbox. all other disabled. And when i check the next, it must be allow to check the next of this.

I have tried with this

$('.fields input[type=checkbox]').click(function(){
  var obj = $(this).siblings('input[type=text]');
  obj.attr('disabled', !obj.attr('disabled'));
})

But i do not get it work.. i have tried also with '.next'... Can anyone help?