How do I change the value of a selectOneMenu on the fly

[laredotornado]

Hi,

I'm using MyFaces 1.1.6 and Tomahawk 1.1.9.  I have this selectOneMenu ...

                                <h:selectOneMenu required="true"
validator="#{historicalTour.validateTime}" styleClass="hourMenu"
id="historicalTour1st_Preference_Hour"
value="#{historicalTour.prefs[0].time}">
                                <f:selectItems 
value="#{historicalTour.timePrefItems}"/>
                                </h:selectOneMenu>

When another text field on the page changes value, I would like to
re-populate the select menu with new options.  I have discovered I just
can't simply do that with Javascript, because when I submit the form I get a 

"Value is not a valid option"

error.  Any ideas how I can change my select menu options and keep JSF
happy?

Thanks, - Dave
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