SQL & PL/SQL

Version: Oracle 10g

I am trying to create a stored procedure that will drop and create a table based on a select statement. I can create the table but I can't drop it.

CREATE OR REPLACE procedure EC_LOAD is
begin
INSERT INTO Sales_table
(FSCL_WK,
DIV,
ACCT_TYPE)
Select
FSCL_WK,
DIV,
ACCT_TYPE
from
sales_revenue;
end ecload;

I need to drop Sales_table before inserting the values. How do i do this?