CodingForums.com - How to set session based Hide/show message notice?

I have set Javascript function to Expand or Collapse my messages.

PHP Code:


		
			




<div onclick="javascript:js_message.expcollap();" style="">&nbsp;</div>



<button id="show">Show</button>





<script language="JavaScript" type="text/javascript">

/*<![CDATA[*/

var js_message = {expcollap:function () {$("#message_notice").click(function(){$("div").hide(1000);});$("#show").click(function(){$("div").show();});

}}

/*]]>*/

</script>

How to set session value that user will see this message only once even he visits page twice (back button or click on the same URL).