Check if asp.net control exists with jQuery
<p>When referring asp.net control inside a MasterPage in this way:</p>

<pre><code>    $(function() { 
        $('#&lt;%=txtMunicipio.ClientID%&gt;').autocomplete({
            source: function(request, response) {
                $.ajax({
                    url: 'http://localhost/Autocomplete/WSAutocomplete.asmx/Poblacion',
                    data: 't=' + request.term,
                    type: 'POST',
                    //contentType: 'text/xml;charset=utf-8',
                    dataType: 'xml',
                    success: function(data) {
                        response(a = $.map(splitResponse(data), function(a, n) {
                            return formatCity(a, n);
                        }));
                    }
                });
            },
            ........
</code></pre>

<p>I am getting error "Object expected" because control does not exist in page. How can I check if control exists before associate autocomplete function?</p>

<p>Thanks in advance</p>
