function doRequest(rtype, ritem, rdo){
    $.getJSON('request.php?act=query&m=ajax',
        {rtype:rtype, ritem:ritem, rdo:rdo}, 
        function(repos){
            if (repos.error != 0)
            {
                alert(repos.message);
            } else {
                $('#req_' + ritem).addClass('req_remove');
                $('#req_' + ritem).html('操作成功');
                $('#req_' + ritem).fadeOut(2000,function(){
                    $('#req_' + ritem).remove();
                }); 
            }
        });
}