Taking your 'Landscapes' gallery as an example...
The baseURL should point towards your gallery folder, not an HTML file within the folder.
flashvars.baseURL = "http://www.gaytewaycustomhomes.com/landscapes/landscapes.html";
flashvars.baseURL = "http://www.gaytewaycustomhomes.com/landscapes/";
With regard to the spacing above your gallery...
Your gallery is within a <td> element which has not been closed. This will invalidate your code and browsers may not know how to display your page correctly (or as you expect it to be displayed).
You can check your page for HTML errors by validating it with the W3C Markup Validation Service.
Once you fix any errors reported and your page validates, it should display with greater predictability and consistency across different browsers.
You can also check your page's CSS with the W3C CSS Validator.
Once the code validates, if you still have space above your gallery, please see the Layout Troubleshooting section of the SimpleViewer-Pro Layout Guide which deals with the question: "I have extra spacing in my gallery. How do I get rid of it?"
Many of the suggestions are for SimpleViewer-Pro only but a couple of them apply to SimpleViewer-Standard, too.
SimpleViewer Support Team