Binding and custom types...

Hello all,
	I was wondering if someone could help me figure out an issue I'm  
having using psycopg2 by way of SQLAlchemy because of my bind  
parameter.  I'm running something like this:

cursor.execute('UPDATE almanacs SET location=%(location)s,  
modified=CURRENT_TIMESTAMP WHERE almanacs.id = %(almanacs_id)s',
{'almanacs_id': 2, 'location':  
"ST_TRANSFORM 
('SRID=900913;01010000007f2ef1fb0b804640cdfc51710f0059c0', 2163)"})


What's coming includes this: SET  
location 
= 
E'ST_TRANSFORM 
(''SRID=900913;010100000033c4b12e6e5544408f554acff48652c0'', 2163)'

Where I need it to be SET  
location 
= 
ST_TRANSFORM('SRID=900913;010100000033c4b12e6e5544408f554acff48652c0',  
2163)

In other words, it's a SQL function, not a text string.  Is there  
anyway to call execute so that it won't escape my string?

Thanks,
Douglas Mayle