get object from iframe with Javascript

If I understood your question correctly, you want to call a Parent Page method from IFrame in the same page. YES you can.
Let say you have below Structure

[mainpage markup]
   [main page JS ]
       function TestMethod()
          {
          }
[main page JS ]
        [iframe id="myiframe"]
         [/iframe] 
[mainpage markup]

Then you can call the TestMethod as below

document.getElementById('myiframe').contentWindow.TestMethod();

contentWindow will return you parent container. Hope this helps !!