The function "mysql_fetch_assoc() " is old mySQL code. Can you try updating line 294 as follows:
Change this:
$row_WeddingRings = mysql_fetch_assoc($WeddingRings);
To this:
$row_WeddingRings = mysqli_fetch_assoc($WeddingRings);
There is also some duplication and old PHP code on the page:
Delete line 8 (<?php require_once('webassist/mysqli/rsobj.php'); ?>) as you've included the file twice.
Delete Recordset1 on lines 94-98 as this appears to be a duplicate and not used on the page.
I think lines 23-88 are surplus to requirements and left over from a previous PHP version. Pretty sure you can delete them.
I would suggest making these changes one at a time on a duplicate of your live page and test every time you make a change. That way it's easier to wind back if something breaks!