How to test connection swf/php/mysql?

Good morning all,
so here I am, trying for the first time to create a database.
After following a tutorial for 2 days about creating a guestbook, I put it happily online and… nothing (what a surprise!). Now where could be the mistake, in flash, in the php, in the setting of my admin??? I then found out in the attached cd (the tut comes from a magazine), that final fla, php and sql file are included. So I put those online (no mistake there it should be) and …nothing.
The only thing I did, is change the first lines of the php text file


$dbhost = "111.111.111.11";//IP where PHPmyadmin is

$dbuser = "onsitus";//nick to access myadmin

$dbpassword = "onsitus";//password to access myadmin

$dbname = "onsitus_db";//name_db

And then created a new database into onsitus_db by uploading the sql file tb_Guestbook into myadmin.
As when I press the submit button on the flash form, nothing happens(not even an error message), how can I test if flash/php/mysql actualy do connect all together?
In general any ideas are welcome. It took me 2 hours to create the flash form and 12 hours to write 2 pages of php and understand how to start phpmyadmin.:lol: