var frameState = $(this).attr('id');

<tr>
   	 <td>
   	 	No Mats:  <input type="radio" name="mattes-radio" align="middle"<?php if($_GET['mattes'] == 0){ echo 'checked="checked"';} ?> id="mattes-radio-0">
     </td>
     </tr>
     <tr>
   	 <td>
   	 	Single Mat: <input type="radio" name="mattes-radio" <?php if($_GET['mattes'] == 1){ echo 'checked="checked"';} ?> id="mattes-radio-1">
     </td>
      </tr>


  $('#mattes-radio-0').click(function() {
window.location = 'index-custom.php?mattes=0';
  });

  $('#mattes-radio-1').click(function() {
window.location = 'index-custom.php?mattes=1';

<input type="radio" id="mattes-radio-0" />
<script>
$("#mattes-radio-0").click(function(){
var param = $(this).attr('id').replace("mattes-radio-","");
window.location = 'index-custom.php?mattes='+param+'&framestate='+framestate;
});
</script>