JQuery Access-Control-Allow-Origin Issue

JQuery Access-Control-Allow-Origin Issue

How do I get rid of  the following error message
 
XMLHttpRequest cannot load http://api.sba.gov/geodata/all_links_for_city_of/Evansville/IN.json . Origin null is not allowed by Access-Control-Allow-Origin.
 
 
 
 
Here is my html file
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">
    <head>
        <title>County Lookup</title>
        <meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
        <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js" type="text/javascript" ></script>
        <script src="http://ziplookup.googlecode.com/git/public/ziplookup/zipLookup.min.js" type="text/javascript"></script>
        <script type="text/javascript">
            $(document).ready(function() {                                  // When the document loads,
                var myurl;
                $('[name=zipcode]').blur(function(){                        // Set on blur
                    $.zipLookup(                                            // Do a Zip code Lookup
                        $(this).val(),                                      // Zip code Field Value
                        function(cityName, stateName, stateShortName){      // If Successful,
                            $('input[name=city]').val(cityName);            // Set City name
                            $('input[name=state_short]').val(stateName);    // Set State abbreviation
                            $('input[name=state]').val(stateShortName);     // Set State name
                myurl = 'http://api.sba.gov/geodata/all_links_for_city_of/' + cityName + '/' + stateShortName + '.json';
                            $('.message').html(myurl);            // Add a message
// Additional way to get County Name using ajax
// $.ajax({
//  dataType: "json",
//  url: myurl ,
//  type: 'GET',
//  success: function (data) {
//    $('.message').html(data);
//    $('input[name=county]').val(data.full_county_name);
//    }
//  }).done(function ( data ) {
//     $('input[name=county]').val(data.full_county_name);
// });

                          var jqxhr = $.getJSON( myurl, function(data) {
                             success: readData(data);
                              
                            })
                            .done(function() {
                               alert( "second success" );
                            })
                            .fail(function() { alert( "error" ); })
                            .always(function() { alert( "complete" ); });
                          function readData(data) {   
                              $('input[name=county]').val(data.full_county_name);
                           }











                        
                        },
                        function(errMsg){                                   // If Zip couldn't be found,
                            $('.message').html("Error: " + errMsg);         // Add an error message
                        });



                $("#div1").load(myurl);
                });
             
            });
        </script>
    </head>
    <body>
        <form>
            <table>
                <tbody>
                <tr>
                    <td>Enter ZipCode:</td>
                    <td><input type='text' name='zipcode' /></td>
                </tr>
                <tr>
                    <td>Enter City:</td>
                    <td><input type='text' name='city' /></td>
                </tr>
                <tr>
                    <td>Enter State Abbr.:</td>
                    <td><input type='text' name='state_short' /></td>
                </tr>
                <tr>
                    <td>Enter State:</td>
                    <td><input type='text' name='state' /></td>
                </tr>
                <tr>
                    <td>Enter County:</td>
                    <td><input type='text' name='county' /></td>
                </tr>
                <tr>
                    <td class='message' colspan="2"></td>
                </tr>
                <tr>
                  <div id="div1"><h2></h2></div>
                </tr>
                </tbody>
            </table>
        </form>
    </body>
</html>