text: jQuery(function($){
  
      // Uploading files
      var file_frame, dfield;
  
      $('body').on('click', '.btn-media-upload' , function( event ){
          event.preventDefault();
          dfield = $($(this).attr('rel'));
  
          // If the media frame already exists, reopen it.
          if ( file_frame ) {
              file_frame.open();
              return;
          }
  
          // Create the media frame.
          file_frame = wp.media.frames.file_frame = wp.media({
              title: $( this ).data( 'uploader_title' ),
              button: {
                  text: $( this ).data( 'uploader_button_text' )
              },
              multiple: false  // Set to true to allow multiple files to be selected
          });
  
          // When an image is selected, run a callback.
          file_frame.on( 'select', function() {
              // We set multiple to false so only get one image from the uploader
              attachment = file_frame.state().get('selection').first().toJSON();
              dfield.val(attachment.url);
  
          });
  
          // Finally, open the modal
          file_frame.open();
      });
      
  });