Pass 2 values in href

[Jackbob]

Hi,
i need a little help:
1) i have done an image gallery with ajax.
2) the thumb are in the page detail.asp, clicking on the thumbs, it pass a value to ajax.js in this way:

<a href="#"  onClick="Richiesta('1');">
<img src="../images/<%=(rs_lavori.Fields.Item("Foto1").Value)%>_t.jpg" alt="Clicca per visualizzare un'anteprima" width="120" height="80" border="0"></a>

3) the ajax.js page, read the value this way:

function Richiesta(Stringa)
{
    if (Stringa.length > 0)
    {
var url = "ajax.asp?id=1&img=" + Stringa.toUpperCase();
        XMLHTTP = RicavaBrowser(CambioStato);
        XMLHTTP.open("GET", url, true);
        XMLHTTP.send(null);
    }
    else
    {
        document.getElementById("risultati").innerHTML = "";
    } 
}

3) then it goes to the url = "ajax.asp?id=1&img=" + Stringa.toUpperCase();
4) I need to pass also the value of id
5) i can read it in javascript in the detail page in this way:

<script language="javascript">document.write("<%=work_id")</script>

How can i pas that value to ajax.js and insert in the url value?
Thank you very much

[Jackbob]

any help would be very appreciated, i can't get out this issue...