@Cams - Yep, I found and tried that before posting but it didnt seem to have any effect, maybe I missed an 'Apply' button or something !

Sort of sorted it in the end by changing the surrounding table colour instead ........
The only problem I seem to have now is that the various 'file type' images are missing from the pop up attachment window when posting. Any idea's on that one ?
Thanks again for a great looking skin ..........