Pop-Up Message Window

I'm trying to add a pop-up message window to my site. It would be something like a pop-up ad, but it would be a message from me to visitors. Anybody knows how to do this?

Thanks.

 

<script type="text/javascript"/>
alert("hey, I wanna tell you bla bla..");
</script>

HTML:

 

LOL dude, I think he wants such like annoucement mod or something... is that want you wanted? :-/

 

Do you need simple alert box or some kind of pop-up window?

 

He needs an announcement script in a popup.
So when a user visits the site a pop-up with dynamic news comes.

 

freepopupcreator.com create one there

 

That's it! It's something like what the prior post offers. Thanks.

 

its work great thnks dude