VC++ WebBrowser call Javascript function in a frame of the main page

I can successfully call JS function in the main page from VC++, but when I call the JS function in frame, GetIDsOfNames() return DISP_E_UNKNOWNNAME. The question can be describe as below:
main page is INDEX.HTM, loaded in webbrowser control, src:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Sample</title>    
    <script type="text/javascript">
function FuncMain()
alert("Main Page Function Called!");
    </script>
</head>
<body>
<div>
  <div id="div_test1">
    <iframe id="page_test1" width="100%" height="100%" src="test1.htm" frameborder="0" scrolling="no"></iframe>
  </div>
  <div id="div_test2">
    <iframe id="page_test2" width="100%" height="100%" src="test2.htm" frameborder="0" scrolling="no"></iframe>
  </div>
</div>
</body>
</html>
test1.htm src:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<body>
<div>Test1 frame page</div>
</body>
</html>
test2.htm src:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <script type="text/javascript">
     function showAlert(x)
alert(x);
 function callVC()
window.external.VCFuncTest();
    </script>
</head>
<body>
<div>Test2 frame page</div>
<div id="test_btn" style="background-color:red;width:100px;height:100px;cursor:pointer;" onclick="callVC();">Test</div>
</body>
</html>
in VC++:
VC++ code can call JS functions by CWebPage class, I found it here:  http://www.codeproject.com/Articles/2352/JavaScript-call-from-C
in my VC project, webPage.CallJScript(_T("FuncMain")) succeeded!
webPage.CallJScript(_T("page_test2.showAlert") failed,  the GetIDsOfNames() return DISP_E_UNKNOWNNAME. BTW, webPage.CallJScript(_T("showAlert")
also failed! Same error.
any help?
Best Regards!

Thanks for your reply Viorel_.
i know i can define a function in the main page: 
function showAlert_Main(x)
        document.frames('page_test2').showAlert(x);
then, webPage.CallJScript(_T("showAlert_Main"))
succeeds.
but this function is just an empty shell doing nothing, and i know there must have a way to call showAlert(x) directly.

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