CKEditor

<script type="text/javascript">
//<![CDATA[

if (typeof CKEDITOR != "undefined") {
  CKEDITOR.on( 'dialogDefinition', function( ev )
  {
    // Take the dialog name and its definition from the event data.
    var dialogName = ev.data.name;
    var dialogDefinition = ev.data.definition;

    // Check if the definition is from the dialog we're
    // interested on (the Link dialog).
    if ( dialogName == 'link' )
    {
      // Remove advanced tab (id, name, language direction, title, etc).
      dialogDefinition.removeContents( 'advanced' );

      // Remove target tab (just allows target to be set).
      dialogDefinition.removeContents( 'target' );

/*
Enable this part only if you don't remove the 'target' tab in the previous block.

      // Get a reference to the "Target" tab.
      var targetTab = dialogDefinition.getContents( 'target' );
      // Set the default value for the URL field.
      var targetField = targetTab.get( 'linkTargetType' );
      targetField[ 'default' ] = '_blank';
*/
    }

    if ( dialogName == 'image' )
    {
      // Remove advanced tab (id, language direction, description, etc).
      dialogDefinition.removeContents( 'advanced' );

      // Remove link tab (url, target, etc. An image can be made into a link via link button instead).
      dialogDefinition.removeContents( 'Link' );

      // Get Info tab.
      var info = dialogDefinition.getContents('info');

      // Remove fields from Info tab.
      info.remove('txtBorder');
      info.remove('txtHSpace');
      info.remove('txtVSpace');
      info.remove('cmbAlign');

      // Validate image alt text.
      var alt = i.get('txtAlt');
      alt.validate = CKEDITOR.dialog.validate.notEmpty( 'Alternative Text is missing.');

      // It's better to put the validation error message in the translation file [ckeditor]/lang/[code].js under key "altMissing".
      //alt.validate = CKEDITOR.dialog.validate.notEmpty( 'ev.editor.lang.image.altMissing );

    }

    if ( dialogName == 'flash' )
    {
      // Remove advanced tab (id, title, background colour, etc).
      dialogDefinition.removeContents( 'advanced' );

      // Remove properties tab (scale, script access, window mode, etc).
      dialogDefinition.removeContents( 'properties' );

      // Get Info tab.
      var info = dialogDefinition.getContents('info');

      // Remove fields from Info tab.
      info.remove('hSpace');
      info.remove('vSpace');
    }

  });
}
//]]>
</script>

CKEDITOR.on( 'dialogDefinition', function( ev )
  {
    // Take the dialog name and its definition from the event data.
    var dialogName = ev.data.name;
    var dialogDefinition = ev.data.definition;

    // Check if the definition is from the dialog window you are interested in (the "Table" dialog window).
    if ( dialogName == 'table' ) {

      // Get a reference to the "Table Properties" tab.
      var tablePropertiesTab = dialogDefinition.getContents( 'info' );

      // Set the default value for the width and height fields.
      var widthField = tablePropertiesTab.get( 'txtWidth' );
      widthField['default'] = '';
      var heightField = tablePropertiesTab.get( 'txtHeight' );
      heightField['default'] = '';

      // Remove the fields, as we're using CSS on the site that automatically styles tables.
      tablePropertiesTab.remove('txtWidth');
      tablePropertiesTab.remove('cmbWidthType'); // The units dropdown (e.g. 'pixels').
      tablePropertiesTab.remove('txtHeight');
      tablePropertiesTab.remove('htmlHeightType'); // The units selection (as chosen via width units dropdown).

    }
  });