The page that you posted does not seem to have any server side code on it. I would need to see a copy of the page that you are working on in the site that has the PHP code on it.
If you are trying to filter your recordset to pull up the size and price info for each item on the page you will need to incorporate the recordset code into the loop of the repeat region on the page. This way you can have a newly filtered recordset for each item on the page. This is a more advanced technique though and this type of thing is normally done on a details page.
When you have a details page for the item like this you can have the recordset filtered just for that item, this way the list of sizes and prices will be specific to that item. Please post back with the page in question in a zip archive and I will take a look at it for you.