function my_form(){
	$form['foo'] = array(
		'#type' => 'textfield',
	);
	$form['actions'] = array(
		'#type' => 'actions',
		'#value' => 'submit',
	);
	$form['actions']['submit'] = array(
		'#type' => 'submit',
		'#value' => 'Submit',
		'#submit' => array('choose_winter_instruction_form_submit'),
	);

	return($form);
}

function choose_winter_instruction_form_submit($form, &$form_state){
  drupal_goto('/');
}