back button w/o headers.....
/*************************************************
this will take the user back one page via javascript by clicking the link
*************************************************/
<a href="javascript:history.go(-1)">Back</a>
OR
/*************************************************
this should output a meta tag and redirect the browser.
if you already have <META> Refresh tags in the document, this WILL
NOT work using IE
**************************************************/
print "<META HTTP-EQUIV="Refresh" CONTENT=0; URL='http://.......'>";