Javascript Validation

This lesson I worked on creating textboxes for the comments and checking if things were all filled in. I first looked at this website.
http://www.php-mysql-tutorial.com/wikis/php-tutorial/creating-a-guestbook-using-php-and-mysql.aspx

I spent a lot of time attempting to figure out what was wrong with the code since it wouldnt work. In the end, the code was too complex and I ended up deleting many essential things.  In the end, i ended up writing my own, but the experience from my previous attempts helped me a lot. I created fields for both names and comments.

However, my checking the validation still did not work. After a lot of puzzling and trialling and erroring, i finally found this site

http://www.tizag.com/javascriptT/javascript-getelementbyid.php

This allowed me to confirm that setting a variable to an html id was actually possible. Also, it told me what i was doing wrong. I had used " instead of '
After fixing this, it was all perfect.