integer array, push and pop

Hi Oleg (and pgsql hackers!),

Recently I encountered a problem attempting to use the integer array
function for pushing an integer onto an integer array field.

Can you write an example of a sql statement for pushing a single value onto
an integer array and for popping a specific value off of an integer array?
I see the function in the documentation, but the actual statement syntax to
use is not clear to me.

Thanks for any help you can provide!

Ryan Mahoney