Fix several Javascript strict warnings. R=alecf

mailnews/compose/resources/content/MsgComposeCommands.js

@@ -945,10 +945,10 @@ function GenericSendMessage( msgType )
 
 				// Before sending the message, check what to do with HTML message, eventually abort.
         var convert = DetermineConvertibility();
-				action = DetermineHTMLAction(convert);
+				var action = DetermineHTMLAction(convert);
 				if (action == msgCompSendFormat.AskUser)
 				{
-                    recommAction = convert == msgCompConvertible.No
+                    var recommAction = convert == msgCompConvertible.No
                                    ? msgCompSendFormat.AskUser
                                    : msgCompSendFormat.PlainText;
                     var result2 = {action:recommAction,
@@ -1492,7 +1492,7 @@ function DetermineHTMLAction(convertible)
             {
                 //See if a preference has been set to tell us what to do. Note that we do not honor that
                 //preference for newsgroups. Only for e-mail addresses.
-                action = prefs.GetIntPref("mail.default_html_action");
+                var action = prefs.GetIntPref("mail.default_html_action");
                 switch (action)
                 {
                     case msgCompSendFormat.PlainText    :

mailnews/compose/resources/content/addressingWidgetOverlay.js

@@ -73,9 +73,10 @@ function Recipients2CompFields(msgCompFields)
 		var ng_Sep = "";
 		var follow_Sep = "";
 
+    var inputField;
 	    while ((inputField = awGetInputElement(i)))
 	    {
-	    	fieldValue = inputField.value;
+	    	var fieldValue = inputField.value;
 	    	if (fieldValue == null)
 	    	  fieldValue = inputField.getAttribute("value");