How to iterate through arrays?

Hi there,

I'm trying to iterate through arrays in PL/PGSQL:
....
DECLARE
update_query CHAR;
update_query_params CHAR ARRAY[6];
BEGIN
update_query_params[1]:='some text';

RAISE NOTICE 'Testing element %', update_query_params[1];
END
.....

It does not 'compile'... :-(. Can you tell me what is the problem?

Thanks,
Nosy