Is it possible to apply an anchor to the background images, and then as a browser window is reduced scale the image down appropriately?
An example of what I mean can be found here: http://www.nspcc.org.uk
When I resize the browser window the hero image appears to stay in a fixed position and just decrease in size.
For my own page here: http://siblingstogether.co.uk/founder/
The background image resizes in such a way that the person who I want to remain at the centre of the image disappears out of vie.