Recommendation needed for a free/open source Flash development tool

I need to develop a simple website which should include two animated objects and want to use Flash. I have no experience with Flash, but I’m a programmer with knowledge in Delphi, C/C++, C# and SQL and have done some web development with Asp.net/C#. Since I need the website to go online soon, I’m looking for a free Flash development tool for which I don’t have to invest too much learning to be able to develop simple animations. So far, I’ve found Flex builder and FlashDevelop, but wanted to ask the SDMB for recommendations before installing and testing the tools.

Ideally, the tool I’m looking for wouldn’t require a deep knowledge and understanding of code and syntax, and would enable me to develop those animations graphically, because as I said, I don’t have that much time to set up the website.