BlackBerry accessing JavaScript variable in BrowserField

I'm using 5.0 BrowserField and I'm able to invoke JavaScript function using

browser.executeScript("..");   

I need to read JavaScript variable. It's possible to directly acces开发者_如何学运维s JS variable, or should I ask 3rd party to provide JS function for that ?

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This works for me:

Object val= null;
                   try {
                       val = browser.executeScript("variable_name");
                   } catch (Exception ex) {
                       // ...
                   }