Rich,
The shower set up in my 1969 HiLo had a split curtain similiar to our 2004. The difference was that in the 1969, the toilet was mounted on the shower pan...so the curtain always gapped open where it had to fold over the toilet. My solution then was to install snaps to hold the curtain halves together. It eliminated some of the tedious inconvenience of having to continuously work the little trolleys around the track to keep the curtain gap closed.
Thanks! Until your post I'd forgotten about that old fix. In our 2004 we have a similiar gap issue, not because of toilet interference, but because (dang it) I'm just not the skinny kid I was at age 24. Think I'll do the same thing in our 2004 to keep the gaps closed (and maybe drop a few pounds too)! This time I'll use Velcro, which wasn't yet commercially available the first time I did this way back when.
Jim