1) we add to the lambdatalk's dictionary the Javascript primitive "dec2bin"
{script
  LAMBDATALK.DICT["dec2bin"] = function() {
    return Number( arguments[0].trim() ).toString(2)
  };
}

2) we use it in the wiki page:
'{S.map dec2bin 5 50 9000}
-> 101 110010 10001100101000
}