It shows Syntax Error: missing : after property id near '<img src=loading.gif />';`

 <script>

    $(document).ready(function() {

        $(#client).on(change, function() {

          var clientid=$(#client).val();



           $.blockUI(



           { 



            '<img src=loading.gif />';

                timeout: 5000



           }); 



        $.ajax({

                type:post,

                url:clientnetworkpricelist/yourfile.php,

            data:title=+clientid,

            success:function(data){

                 $('.blockUI').hide();

                 $(#result).html(data);

            }

        }); 

        });

    });

    </script>