[SORTABLE] make orderable groups

[SORTABLE] make orderable groups

A sortable help, i have this :
as you can see I have two different classes, "item_1" and "item_2," I wish the "item_2" are sortable among the "item_2" and "item_1" between "item_1"..

without dividing into different wrapper !! all with this dom model !

THZ VERY..

  1. <div class="cont">

    <div class="item_1">
    <div>ciao</div>
    <div class="cont"></div>
    </div>

    <div class="item_1">
    <div>ciao 2</div>
    <div class="cont"></div>
    </div>

    <div class="item_2">
    <div>o1</div>
    <div class="cont"></div>
    </div>

    <div class="item_2">
    <div>o2</div>
    <div class="cont"></div>
    </div>

    <div class="item_2">
    <div>o3</div>
    <div class="cont"></div>
    </div>

    <div class="item_1">
    <div>ciao 3</div>
    <div class="cont"></div>
    </div>

    </div>