driftPositions : function() {
        if (!drift)
            return;
        drift = false;
        for (var i = 0; i< this.collection.length; i++) {// loop through tasks
            var taskDiv = $("#"+ this.collection.at(i).id);//get task DOM object
                if (!taskDiv.data('draggable')) {//if taskDiv is not being dragged
                    var slotDiv = $("#slot_" + i);
                    var taskPos = taskDiv.position();//get Pos
                    var slotPos = slotDiv.position();//get Pos
                    var newX = this.closerCoord(taskPos.left, slotPos.left);//gets an x pos closer to the destination
                    var newY = this.closerCoord(taskPos.top, slotPos.top);//gets a y pos closer to the destination
                    if (newY != taskPos.top || newX != taskPos.left) {//if pos is changed
                        taskDiv.css({left:newX, top:newY});//Set new position
                        drift = true;
                    }
                }
        }
    },