Tweaks done for now
You can't imagine what a sense of achievement this has given me. I must be a geek after all!
Unfortunately, due to a lag in it becoming active, the transparent bits are first displayed in grey. To me, the end product looks good but some readers may find the delay annoying. I could just say 'Do yourself a favour, and use a proper browser like Firefox,' but that would be rude. So if you do find it really annoying, let me know and I may consider removing it.
If any geeks out there know how to speed it up, please let me know.