Question about back button and Onload function in a jsp

Hi All,
I am having two jsp pages, say a.jsp and b.jsp. I had a javascript onload function which refreshes all the fields in a.jsp. When i enter some values in a.jsp, based on those values i will be getting the results in b.jsp. Now when i click the back button in b.jsp, it will go to a.jsp again. The problem i am facing is when i click this back button, because of the onload function in a.jsp all the fields in a.jsp are getting refreshed but i want the values which i entered previously in that page. Is there a way that i can do this such that the onload function will not run when i come to that jsp by clicking the back button.
Also i would like to know why a.jsp is reloading when we click the back button in b.jsp and coming to a.jsp. Is this way how back button will function. I am not sure of it. Plz clarify my doubts..
Thx.....

Normally it is not advisable to use the browser back button rather if there is a need we should
implement the back button functionality.
For e.g
In b.jsp
<head>
</head>
<script language="Javascript">
function fnBack()
document.frmHeader.action = "a.jsp";
document.frmHeader.submit();
</script>
<form name="frmHeader" method= "post">
<input type="hidden" name="hdCheckFromB" value="Y">
<p>
<input type="button" name="btnBack" value="Back" onClick="javascript:fnBack();">
</p>
</form>
</body>---------------------------------------
Now , in a.jsp
<%
String strBackParameter = requst.getParameter("hdCheckFromB");
%>
// Now if strBackParameter is carrying a value "Y" , then we know its from B else body onLoad refresh-------------------------------------
Hope this helps.
Thanks

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<blockquote>Locked by Moderator as a duplicate/re-post.
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== Description
==
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