Accessing Content from Different Server

I have developed application using GWT 2.5. When i click on "Click to Open Window" it will open a popup panel wrapping a content from different server loaded inside the Frame.My requirement is to close the popup panel when cancel button is clicked which is loaded from different server.How to Close the popup panel(which is created in main application) its throwing SOP issue?Any suggestion how to solve this same origin policy issue?Below is the code

Main Application Code:(http://localhost:8080/FirstApp/GWTParentApp.html)      btn.addClickHandler(new ClickHandler() {                  @Override                  public void onClick(ClickEvent event) {                      openWindow();                  }              });      private void openWindow(){              PopupPanel dialog=new PopupPanel();              HTMLPanel panel=new HTMLPanel("");              Frame f=new Frame("http://klk7-moham:9090/SecondApp.war/GWTReport.html");              f.getElement().setId("dummyId");              panel.add(f);              dialog.add(panel);              dialog.setSize("1000", "1000");              dialog.show();              dialog.center();              dialog.setAnimationEnabled(true);          }      Report Application Code:(http://localhost:9090/SecondApp.war/GWTReport.html)      <script>      function redirectPage(){            //Code which close the popup panel      }      </script>      <div >          <button type="button" name="cancel"              id="cancelN_" class="bp"              onmouseover="this.className = 'bp bph'"              onmouseout="this.className = 'bp'"              onclick="redirectPage()" style="">Cancel</button>      </div>

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