{{ Html::image("img/icon_plus.png", "icon_open",
        [ "onclick" => $on_click_open, "id" => $id."_open", "style" => $start_pos=="open"?"":"display: none;" ]) }}
    {{ Html::image("img/icon_minus.png", "icon_close",
        ["onclick" => $on_click_close, "id" => $id."_close", "style" => $start_pos=="open"?"display: none;":"" ]) }}