Thanks rudedog1968 - unfortunately the navbar_tab_border stylevar controls the border colour around each navbar item (non-selected, search area, etc). I am happy with the colour thats there, however im trying to work out where to change the border colour for the 'selected' tab in the navbar.
daveaite - I'll get a chance to install and review VB gold in a few hours - hopefully it doesnt require too much hunting