(let ((newresult (cons (string-append (s:any->string key) "=" (s:any->string val))
			       result)))
	  (if (< (length tail) 1) ;; true if done
	      (string-intersperse newresult "&")
	      (loop (car tail)(cadr tail)(cddr tail) newresult))))))

(define (session:link-to self page params)
  (let* ((server    (or (get-environment-variable "HTTPS_HOST") ;; Assuming HTTPS_HOST is only set if available
			(get-environment-variable "HTTP_HOST")
			(get-environment-variable "SERVER_NAME")))
         (force-script  (sdat-get-script self))
	 (script (or force-script
                     (let ((script-name (string-split (get-environment-variable "SCRIPT_NAME") "/")))
                       (if (> (length script-name) 1)
                           (string-append (car script-name) "/" (cadr script-name))

			  "\r")
			 "\\r")
			res)) ;; should return #f if not a string and can't escape it?
      (else      (if (string? res)
		     (s:html-filter->string res '())
		     res)))))

;; params are stored as list of key=val
;;
(define (session:get-param self key type-params)
  ;; (session:log s:session "params=" (slot-ref s:session 'params))
  (let* ((params (sdat-get-params self))
	 (res    (session:get-param-from params key)))
    (session:apply-type-preference res type-params)))

;; This one will get the first value found regardless of form