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How to disable back Button,Back Button Disabling-using Javascript atoz help

Written By M.L on புதன், 23 நவம்பர், 2011 | நவம்பர் 23, 2011

As I have a requirement for disabling the browser back button for both IE and Firefox, for a specific page I need the back button to be disabled using JavaScript OR Server side code?
For example I have 4 pages (page1.aspx, page2.aspx, page3.aspx and page4.aspx) so when I come to page3.aspx the back button needs to be disabled.
I started using the below code but it works only for IE but not for Firefox:

<SCRIPT type="text/javascript">
    window.history.forward();
    function noBack() { window.history.forward(); }
</SCRIPT>
</HEAD>
<BODY onload="noBack();"
    onpageshow="if (event.persisted) noBack();" onunload="">

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