Did you republish your index page when you ticked center in browser? Maybe that is what you need to do, as it is not centered like your others.
Your page does need to be called index, you've done that perfect .... I am referring to the page properties, there is a title box, where you have titled your page, in the pop up box when you click on page properties... it can have a different title there in that box .... (but not how you saved and published the page)
ALT Text - double click on your picture and a pop up will open, there you will see alternate text, here you can add a small description of the picture ...
For your links to open in their own page ... you need to set the target of that link to
_blank .... you will notice when you insert the link there will be a
spot there that says target, there you can change it from being empty now to
_blank ... this will fix that for you ....
You can always start slowly using paypal for your store front, if you have just a few items, that is pretty easy when you are ready...
Great job once again ....
An alternative to the pic resizer is this online image optimizer
It offers you 6 or 7 choices of your picture with its reduced resolution, and will give you the percentage saved and you can choose ...
Click Here for the on line image optimizer ....
:)