absolute positioned images moving around

I have three images on my site which are absolute positioned. When I zoom in or out, the images move up and down. Is there any way aroun开发者_如何学编程d this? Because the issue involved so many elements i thought it was best to link to the site rather than type the entire CSS?

The images in question are the white clouds, blue clouds and the hills.

www.beulahprint.ie/energy.html

Cheers, Colm

Try using fixed instead of absolute.

Try putting the "hills" into the footer-div, give the footer a "position:relative" and position the "hills" with "position:absolute"