how to hide a button if no value in div

this is code which i try to change

<%if(request.getParameter("hiderefineproblem")==null){%>
        <input type="button" value="Refine Problem" onclick="return showHide();" style="background-color: #3399ff;color:#ffffff;" />
    <%}%>

    <div id="showHideDiv" style="display: none;">
        <p>Would one of the following diagnoses apply? Choose the most
            specific one:</p>
        <FORM ACTION="snomedMapping.jsp#newres" METHOD="POST">
        <%
            pstm = Con.prepareStatement(selectsql);
            pstm.setString(1, snomedid);
            pstm.setString(2, snomedname);
            resultSet = pstm.executeQuery();
            boolean bSubmit=false;
            int refid=0;
            String[] pipe;
            while (resultSet.next()) {
                 refid=resultSet.getInt("refid");
                 pipe= resultSet.getString("mapRule").split("\|");

                if (pipe.length > 1){bSubmit=true;
        %>      

            <input type="radio" id="radioList" value="<%=refid%>" name="refId"/>            
            <tr><%=pipe[1]%></tr>
             <br /> 

        <%
            }
            }           
        %>
        <%if(bSubmit){%>
        <input type="hidden" name='hiderefineproblem' value='yes'/>
        <INPUT TYPE="SUBMIT" value="Submit" style="background-color: #3399ff;color:#ffffff;"> 
        <%}%>
        </FORM>

    </div>

    <script>
        function showHide() {
            var ele = document.getElementById("showHideDiv");
            if (ele.style.display == "block") {
                ele.style.display = "none";
            } else {
                ele.style.display = "block";
            }
        }
         </script>

there is button its value is Refine Problem and i need not to show the button if there is no result for that button . the button contains some value from database .sometimes there is no value for that button . so that time i need not to show the button .

how to hide the on click button if the value is empty .