Someone

function variable_get($first_www, $default) {
  global $conf;

  return isset($conf[$first_www]) ? $conf[$first_www] : $default;
} 

function alexa_page() {

  $form['text1'] = array(
    '#type' => 'textfield',
    '#default_value' =>  variable_get('first_www', 'www.digg.com'),
  );