Call another InDesign script with doScript in InDesign CS4 js

Hi, I need to call a separate InDesign script from an active script. Could I do it through java script, or do I need to call applescript to run the InDesign script.

var myJavaScript = "myOtherScript";
app.doScript(myJavaScript, ScriptLanguage.javascript);

Thank you.

Yulia