Added ability to register OnOK handlers. r=hangas

mailnews/addrbook/resources/content/abCardOverlay.js

@@ -21,6 +21,7 @@
  */
 
 var editCard;
+var gOnSaveListeners = new Array;
 
 function OnLoadNewCard()
 {
@@ -90,6 +91,18 @@ function OnLoadEditCard()
 	top.window.title = editCard.titlePrefix + editCard.card.displayName;
 }
 
+function RegisterSaveListener(func)
+{
+  var length = gOnSaveListeners.length;
+  gOnSaveListeners[length] = func;  
+}
+
+function CallSaveListeners()
+{
+	for ( var i = 0; i < gOnSaveListeners.length; i++ )
+		gOnSaveListeners[i]();
+}
+
 function InitEditCard()
 {
 	// create editCard object that contains global variables for editCard.js
@@ -268,6 +281,7 @@ function SetCardValues(cardproperty, doc)
 		cardproperty.custom4 = doc.getElementById('Custom4').value;
 		cardproperty.notes = doc.getElementById('Notes').value;
 	}
+  CallSaveListeners();
 }