not quite sure what you mean by pop up each time some ONE comes by???
there are lots of free and cheap players you can incorporate itnot your site but the easiest is simply use the windows player in your b.v page maker
or you could create a text link with a pop up window if they click on it and this could house your player?
some one may be able to tell you how to have the player pop up as the page is loaded but im not sure how myself sorry
have a look at my **** and pop up ****
HERE