Question

name says it all, but I want to be able to position an element based on a defined distance from the page centre, but the measurement must be between the centre and right hand edge of the element.

is this possible?

Answer 1

I believe this is what you want (if i understand correctly)

position:absolute;
right:50%;
margin-right:-<distance_you_want>px;

parent element should be positioned as well (absolute or relative)

demo at http://jsfiddle.net/gaby/jD443/ (vertical line at center of box for illustration)