Need help cookie

This code works fine on Win NT/IIS with Netscape but not with IE4 : cookie is not set ????? <?php include "include.php"; if (authUser($username,$userpass)) { // do not work with IIS //$exp = gmdate ("M d Y H:i:s", time()-3600); //setcookie("AUTHORIZER",$username.":".md5($username.$userpass),$exp." GMT"); $exp = gmdate("M d Y H:i:s", time()+86400)." GMT"; print "<script language='javascript'>"; print "var expdate=new Date ();"; print "expdate.setTime(expdate.getTime()+(24*60*60*1000*31));"; print "document.cookie='MYCOOKIE='+escape('".$username.":".md5($username.$userpass)."') +';expires=expires '+expdate.toGMTString();"; print "</script>"; } //not header behind print //header("Location: $HTTP_REFERER"); print "<script language='javascript'>"; print "document.location='$HTTP_REFERER';"; print "</script>"; ? $HTTP_COOKIE_VARS['MYCOOKIE'] is always empty in $HTTP_REFERER and this only with IE 4/5 Help !!!!!!!