You would need to add an on/off button (controls) to your FLV project.
Or if you don't want to re-invent your Flash project, you might be able to put Flash element onto a separate web page. Then link to the separate page and make it appear inside an iframe on your parent page.
Keep in mind that Flash/Shockwave files are not viewable in Android, iPhone, iPad, or ITouch. You might want to reconsider the need for Flash since mobile/tablet devices represent a significant number of web users.