Read table date fill in with xsl

Question

<table border="1"  id="table1"> 
    <tr> 
            <th>Data</th> 
            <th>Numero</th> 
            <th>Cliente</th> 
            <th>P_iva Cliente</th> 
            <th>Imponibile</th> 
            <th>Iva</th> 
    </tr> 
    <tr> 

    </tr> 
        <xsl:for-each select="fatture/fattura"> 
            <tr> 
                <td><xsl:value-of select="data"/></td> 
                <td><xsl:value-of select="numero"/></td> 
                <td><xsl:value-of select="cliente"/></td> 
                <td>....</td> 
                <td><xsl:value-of select="imponibile"/></td> 
                <td><xsl:value-of select="iva"/></td> 
            </tr> 
        </xsl:for-each> 
</table> 

    <script type="text/javascript">              
    <![CDATA[ 
            var table = document.getElementById('table1'); 
            var Imponibile = document.getElementById('TotImp'); 
            var Iva = document.getElementById('TotIva'); 
            var Totale = document.getElementById('Tot');     

            var valueImp, valueIva; 
            var totalImp = 0; 
            var totalIva = 0; 
            var Tot = 0; 
            var i; 

            for(i=1; i<table.rows.length; i++){ 
                valueImp = table.rows[i].cells[4].innerHTML; 

                alert(valueImp); 
            } 
    ]]> 
    </script> 

What is the function for read the table tag fill in with xsl...?

not .innerHTML and not .value...

Thanks!