Edit in JSFiddle

function go (){
  var s = new Sutl();
  var result = s.evaluate(
    "Hello World!!", 
    ["&+", "sUTL says ", "^@"], 
    {}
  );
          
  var resultElem = document.getElementById('result');
  resultElem.innerHTML = result;   
}

<h1 id="title">sUTL Hello World</h1>
<input type="submit" id="byBtn" value="Go" onclick="go()"/>
<p id="result" />