[Zope] how to submit variables with an html

Hi, i have a a question. How do i submit more than one var. with an html-form? one: <a href="aendern_bilddaten?gefundene_nummer=<dtml-var bild_nummer>">>Aendern</a> two???: <a href="aendern_bilddaten?gefundene_nummer=<dtml-var bild_nummer>? gefundene_id=<dtml-var bild_id>">>Aendern</a> But the second version does not funktion. Can someone help me. Thanks...Florian Fischer