Resizing Browser On Release Event?

Hey guys,

I want to do something very similar to the resizing effect on this website.

http://www.emrahelmasli.com/site.html

Basically if you resize the browser, it seems like it’s programmed to only display/load/transition in the images once the user lets go of the mouse and the browser is done moving.

I would like to know if there is a Resize on mouse release event or a work around to do this. Currently my images keep refreshing every time you drag/resize the browser screen, before you let go of the mouse.

So basically while your dragging the browser window size to different size it keeps reloading and updating the images. I want it to reload and update the images once the user is done dragging and resizing the browser.

Let me know if this is clear or not.

Thanks.