Drop down panel with ajax only first time on load

I want to use ajax to create a panel that will drop down at the top of my web page when it loads the first time but then would not show for subsequent loads.

I want to put up a welcome message for previous users to tell them how to get to old things they may be used to looking for.   But then if you reload the page that panel would not appear. So basically only appear once per session.

I believe it could be done using ajax and the onload command and I could spent some time figuring out how to do it but if someone can give me a few quick insights of where to start my self training or can provide a sample of someplace that does this with jQuery that would be great.

Thanks.
Paul KonstanskiProject SpecialistAsked:
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GaryCommented:
On first load check for a cookie, if it doesn't exist then show the panel and set a cookie

http://www.w3schools.com/js/js_cookies.asp
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Ray PaseurCommented:
This article shows the general design pattern.  There is no need to use AJAX, (because AJAX is about seamless client/server communication) but there would be nothing to prevent you from using AJAX.
http://www.experts-exchange.com/Programming/Languages/Scripting/PHP/A_3314-How-to-Show-an-Introductory-Web-Page-Once-Using-PHP.html

The general design pattern for jQuery / AJAX requests is shown here.
http://www.experts-exchange.com/Programming/Languages/Scripting/JavaScript/Jquery/A_10712-The-Hello-World-Exercise-with-jQuery-and-PHP.html
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Paul KonstanskiProject SpecialistAuthor Commented:
Good answers that provide a good starting point for me to nail this down. Thanks.
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