JSTL checkbox persisting

Question

I'm having problems with a checkbox always being checked. no matter if I have unchecked it or not when my form is returned to my action class the checkbox is always on. I have seen several threads mentioning this, but none seemed to give me the answer I was looking for. Can anyone look at this and tell me what they see wrong?
I basically need a way to change the value of the form while it is still on the jsp...
I have tried calling a function on the onclick event... but it won't even call the function?
Any help would be greatly appreciated.
<td><fmt:message key="VTFHLForm.crossPlan" />
      <INPUT type="checkbox" name="crossPlan"  
          <c:if test="${session.VTFHLForm.crossPlan eq on}">checked</c:if>/>          
</td>

Answer 1

ok I just changed the way I was doing this... may not be better but I was at witts end with it.... I have set it up to use 0 and 1 for the values of the check box... here is a piece of my jsp code.
<%!
String codeVal = null;
String chkBxVal = null;
%>
<table class="OmniDlgTable">
     <tr>
          <td>
          <table>
               <tr>
                    <td><INPUT type="submit" name="MoreUp" align="left"
                         value="<fmt:message key='Browse.moreup' />"
                         onclick="buttonClick(this);" /></td>
                    <td>
                         <fmt:message key="VTFHLForm.crossPlan" />
                         <%chkBxVal = VTFHLForm.getCrossPlan();%>
                         <INPUT type="hidden" name="crossPlan" value="<%=chkBxVal%>" />
                         <%=chkBxVal%>
                         <%if (chkBxVal != null && chkBxVal.equals("1")) {%>
                              <INPUT type="checkbox" checked name="crossPlan" onClick="return toggleCheckBoxValue(this);" /> 
                         <%} else {%>
                            <INPUT type="checkbox" name="crossPlan" onClick="return toggleCheckBoxValue(this);" /> 
                         <%}%>the function toggleCheckBoxValue just changes the value of chkBxVal to 0 or 1... it is being called.
but when I get back to the action class the crossPlan value is still 0 even after I have checked it.
here is my code for the function
<script LANGUAGE="JavaScript">
           function toggleCheckBoxValue(chkBox){
                alert("here");
             if(chkBox.checked == true){//was unchecked and is checked now, so set the value to 1
             alert("here1");
                chkBox.value= 1;       
             }else{          
             alert("here2"); 
                chkBox.value = 0;
     </script>I have the alerts in there just to verify that it is stepping in... and it is...