Preloader for a page with frames?

I have my first web page divided into three frames, namely logo (top), navigation(left) and the main page. I am running flash movies both in the logo and the main frames. I also have a frameset file for all these frames.\r\rNow I plan to set up a preloader for my site. How can I start a preloader movie and where - I am not sure ? Can someone help !!! I have just started using Actionscript and not yet sure if this can be done. I know for a fact that preloader can be setup as a different scene in the main movie but not sure how it the preloader can control loading of all the three frames. ( Actually I am using dreamweaver to st up my web page).\r\rThanks,\rSangita.