$(function() {
  var jq_content = $('#jq_content');
  var jq_working = $('#systemWorking');
  jq_content.ajaxError(function(request, settings) {
    $(this).html('<span class="red">Error requesting page</span>');
  });
  jq_content.ajaxStart(function() {
    jq_working.show();
  });
  jq_content.ajaxStop(function() {
    jq_working.hide();
  });

  $('#pdf_coordinates').click(function(){
    if ( !jq_content.text() ) {
      jq_content.load($(this).attr('href'),
        function(responseText, stat, response) {
          if (stat == 'success') {
            jq_content.html(responseText);
            $('#pdf_coordinates').hide();
          }
        }
      );
    }
    return false;
  });
});