<div style="width: 1024px; margin: 0px; border: 0px; text-align: right; float:right; padding-top: 5px;" 
                    ID="div_list">
                    <telerik:RadCodeBlock ID="RadCodeBlock1" runat="server">
                <script type="text/javascript">
                    // prendo valore div contenitore radlistview
                    function Height_Div() {
                        var _height = document.getElementById("div_list").offsetHeight;
                        return false;
                    } 
                 </script>
                    </telerik:RadCodeBlock>
........