I'm not so sure (yet) of the programming part there, but I would personally think that a best practice would be to not have a pop-up message at all if it can be helped for any web page. The fact is (or so it seems) that the most people, at least, prefer to not have any extra windows pop-up, especially if it is when you first visit a website. For instance, you go to a web site, and you get a message "click here to scan your computer" or "you may have just one $10,000!" I am no expert on the whole web page programming front (though hope to at least move in that direction over the next couple years), but stylistically speaking, any popups messages/windows would probably eventually annoy any regular viewers/users of your website.
Just a thought - of course, in some situations, it may be necessary - I just meant this as a general idea.
Stephen
"Jesus saith unto him, I am the way, the truth, and the life:
no man cometh unto the Father, but by me." John 14:6 KJV
Pop ups can be very annoying and blocked. You could create a layer with your message onand have a close message button that could also write a cookie that would stop the layer being displayed in future. However if your user has cookies disabled then the layer will always display.
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