PoP-Up window help!

I am trying to create a pop-up window in flash mx using a transparent background, automatically launching as soon as a visitor visits my site.

please take a look at http://imesh.com/newws/ to see what i mean.

now, i know how to create the flash file using a transparent background but i have no idea what code i need to use in order to make it pop-up on my site…

Any help is greatly appreciated…

Mike.