How to implement ajax in struts2 to operate on select box in jsp

How to implement ajax in struts2 to operate on select box in jsp

I am doing a project on struts2 in which i have a jsp page which has 2 select boxes like

<s:form action="">

    <s:select id="d" name="dist" onchange="block();" list="dist_list" label="District" headerKey="-1" headerValue="--Please Select--"></s:select>
    <s:select id="b" name="block" list="block_list" label="Block" headerKey="-1" headerValue="--Please Select--"></s:select>

    </s:form>

now i want that when i select a district the ajax wll be called and retrieve me the blocks under the selected district by assigning to block list select box... plz help me .. its urgent .. thanx in advance ..

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