[xsl] Obscuring static content with flow

[Evan Lenz <evan@xxxxxxxxxxxx>]

Is there a way to obscure static content using flow content?

I have a 2-column layout with a rotated (vertical) rule leader dividing 
the two columns of flow. The leader is defined in a block-container in 
static content. My problem is that there are some blocks in the flow 
that need to span both columns (using <block span="all">). In that case, 
I don't want that vertical rule to be displayed, since it cuts straight 
through the content. Is there a way to hide it or "cover up" a portion 
of the rule using content from the flow?

I've tried using an all-white image to cover up the static content, but 
that didn't seem to work. Either it's fundamentally impossible, or I'm 
missing something fundamental. (I hope it's the latter!)

Thanks for any help anyone can offer,
Evan