How to access Javascript variables in XSL

Hi ,
    I need to access variables declared in Javascript to check for some
conditions.My script is something like this..

    <SCRIPT>
        var OrderNo = "";
        var InvoiceNo = "";

    </SCRIPT>

In XSL I need to use this variables like this..

<xsl:template match="PurchaseOrder">
<xsl:when test="(./PurchaseOrderNo)=OrderNo and
(./InvoiceNumber)=InvoiceNo">

Now this does not choose the javascript variable.I have tried with
javascript:OrderNo.

Can anybody suggest me a way of doing this.

Thanks,
Mani


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