$form['chartrange']['chart_range'] = array(
  '#type' => 'select',
  '#title' => t('Display Range of Chart'),
  '#default_value' => variable_get('chart_range','3 months'),
  '#options' => array(
    '7 days' => t('7 days'),
    '14 days' => t('14 days'),
    '1 month' => t('1 month'),
	 '3 month' => t('3 month'),
	  '6 month' => t('6 month'),
	   '1 year' => t('1 year'),
	    '2 year' => t('2 year'),
		 '3 year' => t('3 year'),
		  '4 year' => t('4 year'),
		   '5 year' => t('5 year'),