Ascertain width of newly injected DOM element

Losing it.

On a mouseover event, I'm inserting a new DOM element that contains child elements.

Based on the content that is injected, there are some positioning tweaks that need to take place.

The problem:
After the element is injected, I cannot get a calculated width. (I always get width:0)

I CAN however, get the width of the new element AFTER the current function has finished executing. What I need is to be able to get the width of the new element before terminating the function that is fired on the mouseover event.

Thoughts?

tried element.offsetWidth? it's not part of the W3C specification, but it could get you what you want.

or getComputedStyle