Working with Wordpress, you might want to redirect users after they login to some specific location. Here is function that could help you to achieve this behaviour.

/**
* Function perform user redirection after login based on role
*
*/
function redirect_after_login() {
  // Get current user info 
  global $current_user;
  get_currentuserinfo();
   
  // Subscriber role
  if ($current_user->user_level == 0) {
    wp_redirect( home_url() );
    exit;
  }
  // Contributor role
  else if ($current_user->user_level > 1) {
    wp_redirect( home_url() );
    exit;
  }
  // Editor role
  else if ($current_user->user_level >8) {
    wp_redirect( home_url() );
    exit;
  }
  // For any other roles
  else {
    $redirect_to = 'http://anysite.com/';
    return $redirect_to;
  }
}
add_action('admin_init','redirect_after_login');