دکمه ی عقب و جلو در سایت یا وبلاگ

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<!-- Start of Back/Forward Buttons Script-->
<!-- Instructions: Just put this script anywhere on your webpage
and you will give your visitor 2 Back and Forward Navigation
buttons. Designed for websites that have multiple webpages.
-->
<SCRIPT LANGUAGE="JavaScript">
<!-- hide this script tag's contents from old browsers
function goHist(a)
{
history.go(a); // Go back one.
}
//<!-- done hiding from old browsers -->
</script>
<FORM METHOD="post">
<INPUT TYPE="button" VALUE=" BACK " onClick="goHist(-1)">
<INPUT TYPE="button" VALUE="FORWARD" onClick="goHist(1)">
</form>

<!-- End of Back/Forward Buttons Script -->