[OS X TeX] twocolumn and centering

[Alex Hamann]

I have a 170-pages document completely set with the twocolumn option.  
I understand that I can put centered text above the two columns by  
adding something like \twocolumn[blablabla]
Now on two occasions I have some text which comes at the bottom of a  
page but has to be centered.

Looking like this:

column1		column2
	this is where
	I want to go

Can anybody point me to a way of just locally breaking the twocolumn  
environment within one page?

TIA,

Alex