How Can I Show State According To Country In Edit Section Of A Form In Cakephp?

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This mistake is coming when first time i am going to open this edit section.i.e if in edit section i am clicking upon state dropdown all the states are coming.It should come like states according to a country.but after clicking upon another state.it is coming fine.so what can i do?

in edit.ctp
<script src="js/jquery.min.1.8.3.js" type="text/javascript"></script>

function showFields(id) 
{ 
  var strURL = '<?php echo HTTP_ROOT; ?>';
   var image = "<?php echo HTTP_ROOT . 'img/ajax-loader-small.gif'; ?>" 
        $('#loader').html("<img src='"+image+"' />");
  $.post(strURL+"venues/ajaxstate",{"country":id},function(data){  
            if(data) { 
			$('#result').html(data); 
			$("#loader").hide(); 
            }
			else
			{
                alert("Error...");	
            }
        });
}