how to navigate back

how to navigate back (on button press) to the page I come from, after I redirected to a page?<BR>can I find out the url I come from?<BR><BR>thanksbasically:<BR><BR>href="javascript:history.back()"<BR>or<BR>href="javascript:history.go(-1)"<BR>or<BR>href='<%= Request.Referer %>'
 
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