Struts: checkbox's previous value remains after unselecting it

hi
I have a checkbox in a JSP in struts environment:
<html:checkbox property="conversionOption"/>now in struts-config, the dynaactionform is :
<form-bean name="QuoteDetailsBean" type="org.apache.struts.validator.DynaValidatorActionForm">
<form-property name="conversionOption" type="java.lang.String"/>
</form-bean>now if the checkbox is not clicked, and in the action class I do:
String s = (String)formbean.get("conversionOption");s is null.
Now when i check(select) the check box, and click on submit the String s is 'on'. After this if I click on 'back' button and then uncheck the checkbox and click submit., the String is still 'on'. I expect it to be null or something other than 'on'.
It seems struts does not set conversionOption property if the checkbox for that property is not selected. so the previous value remains.
how do I overcome this?
I tried by changing :
<form-property name="conversionOption" type="java.lang.String"/>
to
<form-property name="conversionOption" type="java.lang.String[]"/>
but it did not help. changing to String[] will help if i have musltiple checkboxes for the same property. but my form has only one checkbox.
can anybody please help me?
Tanveer

I think u got this wrong.
In struts if the chechbox is unchecked the value is not set to anything and thus its unchecked and nothing is sent to servlet. If u checked and submitted the page then a value called "on" is set to the attribute that represents the checkbox in ur form. Now consider that u checked the checkbox and hit submit. come back and see that checkbox is checked. now uncheckit and hit submit. come back and see it unchecked. now hit back of IE "SHOULD IT BE CHECKED??" ANSWER IS NO. "BACK" button of IE or NS is not equivalant to sending a request? thus in the previous request even if has the property corresponding to the check box is availabe and is "on" and u can see that in the URL(its just a cache ant not exactly the request) the check box will not be checked and viceversa.
clear

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Amith

Hello Amith,
How does a user perform the modification? Do you already have access to the existing value when the user makes the update? How are you identifying the record to be updated within CRMOD and what method are you using to perform the update?
Thanks,
Sean

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