+ (when (and (re-search-forward "<head[\t\n >]" nil t)
+ (progn
+ (setq st (match-end 0))
+ (re-search-forward "</head[\t\n >]" nil t))
+ (re-search-backward "<base\
+\\(?:[\t\n ]+[^\t\n >]+\\)*[\t\n ]+href=\"\\([^\"]+\\)\"[^>]*>" st t))
+ (setq base (match-string 1))
+ (replace-match "<!--\\&-->")
+ (setq st (point))
+ (dolist (tag '(("a" . "href") ("form" . "action")
+ ("img" . "src")))
+ (setq regexp (concat "<" (car tag)
+ "\\(?:[\t\n ]+[^\t\n >]+\\)*[\t\n ]+"
+ (cdr tag) "=\"\\([^\"]+\\)"))
+ (while (re-search-forward regexp nil t)
+ (insert (prog1
+ (condition-case nil
+ (save-match-data
+ (url-expand-file-name (match-string 1)
+ base))
+ (error (match-string 1)))
+ (delete-region (match-beginning 1)
+ (match-end 1)))))
+ (goto-char st)))