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problem with onload


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Hi !I have a page that shows a message using onload.The problem is when I go to others pages and after I go back with the browser to that one wich shows the message. The message appears again.How can I clean the message before go back with the browser to that page ?The code HTML :<% sMsg = (String)request.getAttribute(Defines.PARAM_MENSAGEM);%><%! public String exibe_msg() { String retorno = ""; if ( sMsg != null ) retorno = "alert('" + sMsg + "');"; return (retorno); }%></HEAD><BODY BGCOLOR="#FFFFFF" TOPMARGIN="0" LEFTMARGIN="0" MARGINWIDTH="0" MARGINHEIGHT="0" onload="<%= exibe_msg() %>">Thank you.

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The problem is when I go to others pages and after I go back with the browser to that one wich shows the message.  The message appears again.How can I clean the message  before go back with the browser to that page ?
You could use a cookie, set the value to pagevisited when they first visit the page then each time they return if the value is pagevisited don't show them the message, then set the cookie to expire like 20 mins after each visit or so :)
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