Newbie Q: making flash content safe to browser

I made some flash content and posted it to a google sites web page. It shows up in IE and firefox though the first time you have to answer no to only showing safe content or something.
In chrome it does not show up at all.

So my question (maybe more web than flash related) is how I make the browsers think it is safe content? - how do I sign it if that is the term?
Any helpful links would be useful.

A