Make sure that you have set all the permissions correctly for the install, if you haven't you may not have access to execute the required libraries for the db interface. If this site is on godaddy and your other one isn't it might be possible that there is something wrong with the php instance you are using on godaddy. Your versions of php needs to have its database modules enables in order to talk to a database server.

See your exact error here

Function mysql_connect() not found. Your system does not appear to have MySQL available within PHP.

The systems is telling you, your implementation of php does NOT have mysql support, which to pretty strange.

Make a a page and put phpinfo() in the page. It will return information on your implementation of php so we can see what is happening with the modules it is loading.

First, thank you very much for your help on this.

Both sites are hosted under GoDaddy on the same type of plan, which is what is confusing me. They should be the same setup.

I added the info script here:
http://landslidecampaigns.com/info.php...

I also added the script from the site where it is working here:
http://www.robamos.com/info.php...

Although there are some minor differences, I am not sure what I need to change on the GoDaddy side to correct this.

If you look at the site that is working, GD is enabled, simple text is enabled, and there is an active mysql module loaded to.

The key to your problems is trying to find out why your other install on godaddy is missing the mysql modules. This is a problem with the php engine on your site that isn't setup correctly. The site that isn't working is missing GD, simple text, and sql modules from its run-time, in other words they are either not there or not enabled.

See this from your working site:

mysql

MySQL Support enabled
Active Persistent Links 0
Active Links 0
Client API version 5.0.45

Thanks for pointing this out. Same host, same plan, different configurations. Figures.