function isExitsFunction(funcName) {

  try {

    if (typeof(eval(funcName)) == "function") {

      return true;

    }

  } catch(e) {}

  return false;

}

function isExitsVariable(variableName) {

  try {

    if (typeof(eval(variableName)) == "undefined") {

      //alert("value is undefined");

      return false;

    } else {

      //alert("value is true");

      return true;

    }

  } catch(e) {}

  return false;

}