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loading JSON data to grid

Hi,
    in my grid i want to load the json data which is coming from servlet.
mygrid.load("/admin/manage/country?action=loadData","json");
onchange of active/inactive/all i want to send value of changed option ie active or inactive or all .
please tell me how to append and send the option value and url. so onchange of option value i want to laod json data in my grid.


Regards,
Ravindra B

<select onchange="reload_grid(this.value)" > 
            <option value="all">All</option>
             ...
</select>

function reload_grid(mode){
     mygrid.clearAll();
     mygrid.load("/admin/manage/country?action=loadData"&mode="+mode,"json");
}