[jQuery] Corner Plugin affects layout

[jQuery] Corner Plugin affects layout


When I apply the corner plugin to an element on the page, the layout
is affected when I hover over a link with padding. This only seems to
occur in Internet Explorer (IE 6 and 7), and I am unable to find out
the cause.
To replicate, go to http://www.nelctp.nhs.uk
Resize the browser window (making it bigger illustrates the problem
better), the boxes in the middle should move (to stay in the centre),
but they don't. Then mouse over one of the links on the right. The
right box moves to the correct position when this happens.
I know it is the corner plugin, as a test without it applied works:
http://www.nelctp.nhs.uk/?nocorner