ExternalInterface question

programming flash
1

How would I call this javascript function and recieve the error code back if any.

[AS]
import flash.external.ExternalInterface;
ExternalInterface.call(“SCOInitialize”, My_error );
function My_error(err:String )
{
mytext_txt.text = err;
}
[/AS]

My java script function


function SCOInitialize() {
 var err = true;
 if (!g_bInitDone) {
  if ((window.parent) && (window.parent != window)){
   g_objAPI = FindAPI(window.parent)
  }
  if ((g_objAPI == null) && (window.opener != null)) {
   g_objAPI = FindAPI(window.opener)
  }
  if (!APIOK()) {
   AlertUserOfAPIError(g_strAPINotFound);
   err = false
  } else {
   err = g_objAPI.LMSInitialize("");
   if (err == "true") {
    g_bSCOBrowse = (g_objAPI.LMSGetValue("cmi.core.lesson_mode") == "browse");      if (!g_bSCOBrowse) {
     if (g_objAPI.LMSGetValue("cmi.core.lesson_status") == "not attempted") {
      err = g_objAPI.LMSSetValue("cmi.core.lesson_status","incomplete")
     }
    }
   } else {
    AlertUserOfAPIError(g_strAPIInitFailed)
   }
  }
  if (typeof(SCOInitData) != "undefined") {
   // The SCOInitData function can be defined in another script of the SCO
   SCOInitData()
  }
  g_dtmInitialized = new Date();
 }
 g_bInitDone = true;
 [COLOR="red"]return (err + "") [/COLOR]// Force type to string
}