[Draggable.js - Change configuration vars on DragStart]

Hello guys.

 

My Draggable object:
 

Draggable.create(document.getElementById('el'), {
	minimumMovement: 50,
    type: 'y',
    onDragStart: function()
  	{
    	this.minimumMovement = 1;
      	this.type = 'x,y';
    },
  	onDragEnd: function()
  	{
    	this.minimumMovement = 50;
      	this.type = 'y';
    }
});

 

I have default minimumMovement and type properties. When Drag starts I want to change this properties and when drag ends I want to set this properties to the default values. But It doesn't works.
Can you help?