Uploading files and back button

>
> Hello.
>
> I have a form that is happily uploading a file using xs:anyURI binding and
> thus storing it as a temporary file in Tomcat.
>
> However, if I then press the back button the form field display the file
> details with a remove cross. If I click 'upload' again there is an error as
> I don't think the file is actually being uploaded again.
>
> I'd quite happily settle for not having the file details and getting back
> the empty field ready for a user to select another file.
>
> I'm using the following:
>
> <xforms:model>
>        <xforms:instance id="files-instance">
>                <parameters xmlns="">
>                        <file filename="" mediatype="" size=""/>
>                        <format>xml</format>
>                </parameters>
>        </xforms:instance>
>        <xforms:instance id="response-instance">
>                <instance xmlns=""/>
>        </xforms:instance>
>        <xforms:instance id="control-instance">
>                <control xmlns="">
>                        <simple-upload-trigger/>
>                </control>
>        </xforms:instance>
>        <xforms:bind nodeset="instance('files-instance')">
>                <xforms:bind nodeset="file" type="xs:anyURI"/>
>        </xforms:bind>
>        <xforms:submission id="background-submission" method="post"
> action="/enriched" instance="response-instance"/>
> </xforms:model>
>
>
> <xforms:upload  ref="instance('files-instance')/file[1]" xxforms:size="60">
>        <xforms:filename ref="@filename"/>
>        <xforms:mediatype ref="@mediatype"/>
>        <xxforms:size ref="@size"/>
> </xforms:upload>
> <xforms:trigger ref="instance('control-instance')/simple-upload-trigger">
>        <xforms:label>Upload File</xforms:label>
>        <xforms:action ev:event="DOMActivate">
>                <xforms:setvalue
> ref="instance('files-instance')/action">simple-upload</xforms:setvalue>
>                <xforms:send submission="background-submission"/>
>        </xforms:action>
> </xforms:trigger>
>
>
> Can someone point me in the direction of a solution?
>
> Thanks
>
> Paul
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>
>
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>