Displaying Current Article Image on Every Page

I am developing a theme but have hit a problem.
I am trying to grab the current article image and display on every page.
I am unable to do so on every page but can see that this is shown in the journal and from the article page.
So from the article.tpl I thought I thought I could just hook into
But im not really seeing any way of doing so.
Im really confused on how to display the current image on every page in a certain spot.
Any Ideas?

I have been looking through and found this link

But am unsure how to implement this to grab the actual variable.