Index: trunk/admin/include/tabs.js
===================================================================
diff -u -N -r104 -r203
--- trunk/admin/include/tabs.js	(.../tabs.js)	(revision 104)
+++ trunk/admin/include/tabs.js	(.../tabs.js)	(revision 203)
@@ -137,7 +137,7 @@
 function edit_submit(formname, status_field, targetURL, save_value, env_str, new_target)
 {    
       var full_env = env;
-      if(env_str != null) full_env += env_str;
+      if( HasParam(env_str) ) full_env += env_str;
 
       if(full_env.substr(0,3)!="env")
         full_env = 'env='+full_env;
@@ -181,10 +181,10 @@
 }
 
 //Used when the save or cancel buttin is hit	
-function do_edit_save(formname, status_field, targetURL, save_value,env_str)
+function do_edit_save(formname, status_field, targetURL, save_value, env_str)
 {    
 	  var full_env = env;
-	  if(env_str != null) full_env += env_str;
+	  if( HasParam(env_str) ) full_env += env_str;
 	  if(full_env.substr(0,3)!="env")
         full_env = 'env='+full_env;		
         
@@ -203,23 +203,23 @@
         	alert('Form '+formname+' was not found.');	
 }
 
-function jump_to_url(targetURL,env_str)
+function jump_to_url(targetURL, env_str)
 {
 	  var full_env = env;
-      if(env_str != null) full_env += env_str;
+      if( HasParam(env_str) ) full_env += env_str;
       
 	  if(full_env.substr(0,3)!="env")
         full_env = 'env='+full_env;		
 	
 	  document.location = rootURL + targetURL + '?' + full_env;
 }
 // -------------------------------------------------------------------------------------------------------------
-function submit_form(formname, status_field, targetURL, save_value,env_str)
+function submit_form(formname, status_field, targetURL, save_value, env_str)
 {    
 	// by Alex, submits form.      
       
       var full_env = env;
-      if(env_str != null) full_env += env_str;
+     if( HasParam(env_str) ) full_env += env_str;
       if(full_env.substr(0,3)!="env")
         full_env = 'env='+full_env;
 	  
@@ -258,4 +258,10 @@
       }
       else
         alert('Form '+formname+' was not found.');
+}
+
+function HasParam(param)
+{
+	// checks of parameter is passed to function (cross-browser)
+	return typeof(param) == 'undefined' ? false : true;
 }
\ No newline at end of file