5
I've no idea whether this is helpful or not, but I believe the trick to stopping links leaving your site is to use the _parent or _blank attributes when setting the parameters of the
link? So http://www.blah "target=parent" will (I think) open it in your main central block. "target=blank" will open a new instance of your browser, in other words, IE or Mozilla will open and load the page for you, leaving your site open in another instance of your browser?
I'm sure the experts will clarify this, but I just thought I'd mention it.