drop tables if exists

[Allen Gilliland]

anyone know if the sql syntax for "drop table if exists <tablename>" is 
standard across all dbs?  i would like to update our drop tables script 
because i tend to get my test dbs in a strange state from time to time 
where not all the tables are dropped and the current script dies when it 
tries to drop a table that doesn't exist :/

so, anyone opposed to updating the droptables script to include "if exists"?
-- Allen