Possible Answers

1. Welcome to http://www.webdevelopersnotes.com
   (The variable lies outside the parenthesis, hence its value is displayed.)
2. My favorite movie is my_movie
   (JavaScript cannot interprets my_movie as a variable since its enclosed in the quotes.
3. The sum total is sum_total
   (Variable placed inside quotes. JavaScript makes no discrimination between a string data or numeric data when displaying variable values)

4. 
   function msg(name)
      {
      alert("Welcome " + your_name_here);
      }
   
   // Calling the function
   
   msg("your_name_here");
   

5. function msg(name)
      {
      window.defaultStatus("Welcome " + your_name_here);
      }
   
   // Calling the function
   
   msg("your_name_here");
   
   

   You might ask why we use defaultStatus instead of simply window.status. The reason is that window.status is associated only with event handlers and cannot recognize a variable even if its outside the quotes.