I'm trying to make a function which calls a php script and then get the users password and return it.

I use post for this. When i use return inside post or outside but i declared a variable inside post it doesnt work either. But if i return the username it works fine. This is my code

--- JAVASCRIPT ---

function getpass(username)

{

      $.post("getpass.php", {Username: username}, function(response)

      {

            return response; // the php script works fine, i tested it.

      });

}

function displaypass()

{

      if(getpass("admin") == PasswordInput)

      {

            alert("Password is correct");

      }

      else

      {

            alert("Wrong, the pass is " + getpass("admin"));

      }

      // This alert getpass(admin) doesnt work, it only shows me Wrong, the pass is 

}