How to access Java Script associated with a button in a page and capture a new window.

Hi ,
  
  I am starting off workin on with the HTTP Unit. I am trying to simulate a flow for login.
  
  There is an  Intial page , which contains  a Button  -Launch. This page doesnt have any Forms.
  There is a Java Script associated with the 'Launch' Button ,which on click opens up the Login page in a "New Window".
  
  I need to get this simulated and get the Login Page ,to do the Login into the App.
  I am stuck in accessing the Java Script to simulate this flow.
  Can someone provide me with ways how to get this done.
  
  Refference : Page Details.
  Button Description on the page:
          <input id="launchBtn"  type="button" value="Launch Web Access" onclick="launch(false);">
  
  Java Script:
   function launch(accessibleMode) {
        // Provoke the IE popup blocker
        setTimeout(function(){launchWindow(accessibleMode)}, 10);
      }
  
      function launchWindow(accessibleMode) {
        var loginPage = "/app/login.jsp";
        if (accessibleMode) {
          loginPage += "?accessible=true";
        }
        // Center the pop-up window on the screen, and default it to 80% of
        // available screen height and width (but no smaller than 640x480 and
        // no larger than 1024x768):
        var scaleFactor = 0.80;
        var popupWidth = 690; //Math.max(640,  Math.min(1024, Math.floor(screen.availWidth * scaleFactor)));
        var popupHeight = 500; //Math.max(480,  Math.min(768, Math.floor(screen.availHeight * scaleFactor)));
        var popupLeft = Math.max(0, Math.round((screen.availWidth - popupWidth) / 2));
        var popupTop = Math.max(0, Math.round((screen.availHeight - popupHeight) / 2));
        var wName = 'ocsweb_'+hName.replace(/\W/g,"");
  
        try {
          var w =  window.open(loginPage, wName, 'width=' + popupWidth + ',height=' +  popupHeight + ',left=' + popupLeft + ',top=' + popupTop +  ',resizable=yes,status=yes');
          if (w == null) {
            popupWarn();
          }
          else {
            w.focus();
          }
        }
        catch(e) {
          popupWarn();
        }
      };
  
  Thanks ,
  Hari.
  
				
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