Dynamically name form fields

Hello,

I need to populate the value of a dynamically generated form field name.  But wrapping in an eval() does not work (at least the way I'm doing it).  Can someone show me how to properly do this?  Everything works fine down to where I try to assign the value of "cellPhone" to the dynamically named form field (the 'eval' line).

function putCell(ct) {
        var AC = eval("document.CFForm_1.cellA_"+ct+".value");
        var PX = eval("document.CFForm_1.cellP_"+ct+".value");
        var SX = eval("document.CFForm_1.cellS_"+ct+".value");
        var cellPhone = AC+"."+PX+"."+SX;
        eval("document.CFForm_1.document.CFForm_1.phoner_"+ct+".value") = cellPhone;
        document.getElementById('a11_'+ct).innerHTML = cellPhone;
        document.getElementById('a11_'+ct).style.visibility = 'visible';
        document.getElementById('a12_'+ct).style.visibility = 'hidden';
}

Thanks,
Dave

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