Expression matching related question

Hi,

I wish to do a query such as:
SELECT * FROM table WHERE column='something' AND column2='something
else' AND (network='0' OR (left=0 AND network>0));

However, when I execute this in phppgadmin I'm told there is an error
around the = character in left=0. Can't seem to figure the syntax.

Help would be appreciated.

Regards,
Peter Hoskin