code: function createLookupTable(option, default_value, extend) {
  			var value = settings[option];
  
  			if (!value) {
  				// Get cached default map or make it if needed
  				value = mapCache[option];
  
  				if (!value) {
  					value = makeMap(default_value, ' ', makeMap(default_value.toUpperCase(), ' '));
  					value = tinymce.extend(value, extend);
  
  					mapCache[option] = value;
  				}
  			} else {
  				// Create custom map
  				value = makeMap(value, ',', makeMap(value.toUpperCase(), ' '));
  			}
  
  			return value;
  		}
docs: Creates an lookup table map object for the specified option or the default value