Javascript history.back() does not work in netscape 7.2

Javascript history.back() does not work in netscape 7.2 .Even if i right click mouse and try to do back from there it doest work. But it works fine in IE .
I am not using any thing specific in that page, just dynamically creating text boxes.

I have downloaded netscape 7.2 from
http://channels.netscape.com/ns/browsers/download.jsp

Even i tried with  javascript:history.go(-1) on onclick event. it fails.