javascript - Change items in a drop-down list depending on the selected option in another drop-down list -


i have following code:

<select name="trec"> <? $d -> gettreatment(); ?> </select> <select name="treratment"> <? $d -> gettreat(); ?> </select>

the <? $d -> gettreatment(); ?>

will display echo "<option value='$r[id]'>$r[cat]</option>";

and <? $d -> gettreat(); ?>

will display echo "<option value='$r[id]'>$r[treatment]</option>";

how dynamically narrow down (or limit) items in second drop down list based on selected item first selected item? example if have 1 list of countries in first drop down list , have list of states in second list once usa selected country list second list should change list states of usa

<script type="text/javascript">     $(function() {       $("#form_process").click(function() {         //$("#choice").val(); //you cannot use same id more 1 tag         var choice = 0;               if(document.getelementbyid("choice1").checked) choice='yes';         else if(document.getelementbyid("choice2").checked) choice='no';         else if(document.getelementbyid("choice3").checked) choice='dont know';          var comments = document.getelementbyid('comments').value; //$("#comments").val();         var datastring = 'choice='+ choice + '&comments=' + comments;          $.ajax({           type: "post",           url: "**absolute url processor**",           data: datastring         });      });    }); </script>

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