how can I referesh my page?

how can I refersh my page if user use back button on my web site?

I have a form which has a javascript function, if the user select one of my menü, the other menu comes up with the related data,
however if user use back button instead of the link, the second menu doesn't comes up with a data

if I refersh the page, problem will be solved.
my pages are php
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BraveheartliMarketingAsked:
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Ferruccio AccalaiConnect With a Mentor Senior developer, analyst and customer assistance Commented:
Another way is to use meta tags in head section

<head>
<meta http-equiv="Pragma" content="no-cache">
<meta http-equiv="Cache-Control" content="no-cache, must-revalidate">
<meta http-equiv="Expires" content="Mon, 26 Jul 1997 05:00:00 GMT">
</head>

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BraveheartliMarketingAuthor Commented:
I use this code and it works

    <input type="hidden" id="refreshed" value="no">
<script type="text/javascript">
onload=function(){
var e=document.getElementById("refreshed");
if(e.value=="no")e.value="yes";
else{e.value="no";location.reload();}
}
</script>
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Amita SinghConnect With a Mentor Web DeveloperCommented:
try this
window.onpageshow = function(event) {
    if (event.persisted) {
        window.location.reload() 
    }
};

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BraveheartliMarketingAuthor Commented:
thank you both
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