Set Position of Draggable div

Set Position of Draggable div

How is it that I set the position of the draggable div. I see in the documentation that there is an object called ui.position.

I assume I can some how set this? If not would I simply have to change the CSS using javascript and set a position? If so if someone could help me out with a code example that would be helpful.

I have a button which changes the display from none to block so the div is visible. When I set display back to none and then back to block so it reappear it is still in the same place (obviously.)

I need to be able to set it to it's original position.