problem when make change on the select

[elyes sallem]

hello,
i have a select element where i display prjLib as label
here is the code part of this component :

<nested:nest property="selectedProject">
                    <nested:hidden property="prjLib"/>
                        <nested:select property="prjId"
                            onchange="form.action='EditSaisiProv.do?do=
refreshProjet';form.submit();">
                            <html:optionsCollection property="projetList"
value="prjId"
                                label="prjLib" />
                        </nested:select>
                    </nested:nest>

the problem is when ,in the list of project , i have several elements
if i try to change the project through the select
it remains the same, after select change on the select button
the project id remains the same

any one has an idea?

Thanks
Regards
Elyes.