As you can see, you need to know the htmlname of your element.

 

The cross is image40

And you need to add variables for the x and y position of your element... Like here...

If you now move/change the position of the Cross by clicking on it... then click the button Show X/Y Position... the postion is shown in the textfield.

 

Only Javascript needed is on the button

The cross is now at x-position 34 and y-position 447