OK, I seem to have got it semi working on an Admin only skin. For some reason all posts using the ASM tag made prior to 11:05 pm BST (+1 GMT) yesterday are parsing the code for the tag correctly. The css needs tweaked for this skin, but should work perfectly on skins with dark backgrounds. However, posts made from 11:06 pm BST (+1 GMT) onwards aren't parsing the code. Don't know why. But, at least I'm getting somewhere.