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Adding form:option dynamically

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I am using 2 <form:select> tags on my jsp page, one for list of countries & other for list of states in that country. What I am doing is, once a country is selected, then through dwr I am calling my controller & getting back list of state objects. Each state object is populated with name & code of state. Now I want to add the state list names & code to the <form:select> related to state. I could not find any way to add this dynamically. Can anyone give me any suggestions or hints?

I have tried to use dwr API as follows:-
for(var i =0; i<data.length;i++){
dwr.util.addOptions(selectbox, [data[i].name]);
But this will add ><option> tag & not <form:option> tag.
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