Script de pesquisa em lista Sharepoint

<script type="text/javascript">

    function RedirectUrl() {
        var tb = document.getElementById("tbSearch").value;
        var cs = document.getElementById("sfield").value;
        var url = "";

        if (tb != "") {
            if (cs == "Column2" || cs == "Column3" || cs == "Column4" || cs == "Column5") {
                url = "FilterField1=" + cs + "&FilterValue1=" + tb;
                window.location.href = "Lista%20Telefnica%20Completa.aspx?" + url;
            }
            else {
                url = "FilterName=" + cs + "&FilterMultiValue=*" + tb + "*";
                window.location.href = "Lista%20Telefnica%20Completa.aspx?" + url;
            }
        }
        else {
            return false;
        }

    }

function myFunction(event) {
var x = event.keyCode;
if (x == 13) {
event.preventDefault();
        return RedirectUrl();
}
}

</script>

<select id="sfield">
<option value="Title">Nome</option>
<option value="Matricula">Matrícula</option>
<option value="Empresa">Empresa</option>
<option value="Setor">Setor</option>       
</select>
<input id="tbSearch" type="text" onkeydown="myFunction(event)"/>
<input id="btnSearch" onclick="return RedirectUrl();" type="button" value="Procurar"/>