now the error being returned is:
<b>Notice</b>: Use of undefined constant MHASH_MD5 - assumed 'MHASH_MD5' in <b>/home/jbarracks/public_html/testing/WA_eCart/checkoutScripts/WA_simlib.php</b> on line <b>30</b><br />
meaning the MD5 hashing algorithm is not enabled, this is needed to generate the fingerprint hash that submits the order to authorize.net.
mhash and the MD5 algorithm will need to be enabled on the server.
for help with database connection issues, you contact the host.
I have had good luck using either 1 and 1 or Dreamhost for hosting.