put below javascript in head tag of first page which comes when you login
<script type = "text/javascript" >
function preventBack()
{
window.history.forward();
}
setTimeout("preventBack()", 0);
window.onunload=function(){null};
</script>
<script type = "text/javascript" >
function preventBack()
{
window.history.forward();
}
setTimeout("preventBack()", 0);
window.onunload=function(){null};
</script>
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