diff --git a/phpgwapi/inc/class.common.inc.php b/phpgwapi/inc/class.common.inc.php
index 4167c91db9..a2388dea52 100644
--- a/phpgwapi/inc/class.common.inc.php
+++ b/phpgwapi/inc/class.common.inc.php
@@ -1122,7 +1122,10 @@
 					// create popup target
 					if ($data['status'] == 4)
 					{
-						$GLOBALS['phpgw_info']['navbar'][$app]['target'] = ' target="'.$app.'" onClick="'."if (this != '') { window.open(this+'".(strstr($GLOBALS['phpgw_info']['navbar'][$app]['url'],'?')?'&':'?')."referer='+encodeURI(location),this.target,'width=800,height=600,scrollbars=yes,resizable=yes'); return false; } else { return true; }".'"';
+						$GLOBALS['phpgw_info']['navbar'][$app]['target'] = ' target="'.$app.'" onClick="'."if (this != '') { window.open(this+'".
+							(strstr($GLOBALS['phpgw_info']['navbar'][$app]['url'],'?') || 
+							ini_get('session.use_trans_sid') && $GLOBALS['phpgw_info']['server']['sessions_type'] == 'php4' ?'&':'?').
+							"referer='+encodeURI(location),this.target,'width=800,height=600,scrollbars=yes,resizable=yes'); return false; } else { return true; }".'"';
 					}
 
 					if ($app != $GLOBALS['phpgw_info']['flags']['currentapp'])