I have some code like this

function doSomething(){
      Jquery.ajax(type: "POST",
                url: "HelloWorld",
                 success: function (msg) {
                 if(msg.d =="Hello World")
                 {
                     return true;
                 }else
                  {
                     return false;
                  }
                 }

      );
}

i want to know something based on which the return value of the succes function. Can somebody help?