How to remove only position(top and left) of Style attr using JQuery?

I am dynamically setting the position attr of the element only when the view is out of viewport of the window, in other case default value is set from the css file ,

.css( { "left": (left + 20) + "px", "top": (top+10) + "px" } );

Once the dynamic position is set, I want to remove the position attr alone.

I can remove style attribute it will also my display property of style which is required.

Is there a way to to remove the position attr alone?