manipulateDOM.js

var manipulateDOM = function() {
  var body=document.getElementById("body");
  var div=document.createElement("div");
  
  if(div){
      div.id = "gameContent";
      var canvas=document.createElement("canvas");
      canvas.id = "gameCanvas";
      
      try {
        body.appendChild(div);
        div.appendChild(canvas);    
      } catch (e){
        document.write(e);
      }
    }
};
manipulateDOM();