+/** Include required files from SM */
+include_once(SM_PATH . 'functions/imap_mailbox.php');
+
+/**
+ * Output a SquirrelMail page header, from <!doctype> to </head>
+ * Always set up the language before calling these functions.
+ *
+ * Since 1.5.1 function sends http headers. Function should be called
+ * before any output is started.
+ * @param string title the page title, default SquirrelMail.
+ * @param string xtra extra HTML to insert into the header
+ * @param bool do_hook whether to execute hooks, default true
+ * @param bool frames generate html frameset doctype (since 1.5.1)
+ * @return void
+ */
+function displayHtmlHeader( $title = 'SquirrelMail', $xtra = '', $do_hook = TRUE, $frames = FALSE ) {
+ global $squirrelmail_language, $sTemplateID, $oErrorHandler, $oTemplate;
+
+ if ( !sqgetGlobalVar('base_uri', $base_uri, SQ_SESSION) ) {
+ global $base_uri;
+ }
+ global $custom_css, $pageheader_sent, $theme, $theme_default, $text_direction,
+ $default_fontset, $chosen_fontset, $default_fontsize, $chosen_fontsize,
+ $chosen_theme, $chosen_theme_path, $user_themes, $user_theme_default;
+
+ /* add no cache headers here */
+//FIXME: should change all header() calls in SM core to use $oTemplate->header()!!
+ $oTemplate->header('Pragma: no-cache'); // http 1.0 (rfc1945)
+ $oTemplate->header('Cache-Control: private, no-cache, no-store'); // http 1.1 (rfc2616)
+
+ // don't show version as a security measure
+ //$oTemplate->header('X-Powered-By: SquirrelMail/' . SM_VERSION, FALSE);
+ $oTemplate->header('X-Powered-By: SquirrelMail', FALSE);