Draggable panels

/in /by 
<div class="ClassRow ClassSortable" id="mainrow">
    <div class="ClassCellMargin" style="width:50%">
        <div class="ClassCellMargin ClassBorder ClassSort">
            <div class="ClassPanel">
                Panel 1
            </div>
            ...
        </div>
    </div>
    <div class="ClassCellMargin" style="width:50%">
        <div class="ClassCellMargin ClassBorder ClassSort">
            <div class="ClassPanel">
                Panel 2
            </div>
            ...
        </div>
    </div>
</div>