Line Crossings

[James Turnbull]

Apologies if this has been covered before but I couldn't find anything 
in the list archives.

The digram I am using omnigraffle to draw is pretty large and complex, 
with may overlapping lines. I was looking for some way to clearly show 
that these lines are crossing, rather than being connected. I was 
therefore looking for some way in omnigraffle for lines to "bridge" 
over each other, where the top line has a curve in it, sort of like a 
bridge over the other line.
This is rather hard to explain, so I scanned in a little (2KB) 
example...

http://shreddies.org/temp/bridgeexample.jpg

Sadly I don't know what program this image was drawn with, otherwise 
I'd just use that :P

So, is this possible in Omnigraffle?

Thanks for any help,

James

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