My I suggest that up update to FMS15 and start using FileMaker WebDirect instead where you can control your layouts and script inside FileMaker
It's worth a try!
Also, browsers can have "developer mode" or "developer tools" or "inspectors" or various add-ons that allow you to see a lot more than what is displayed in the window to the user. These can be very helpful.
upgrade, yes, always good advice. WebDirect is still limited in some ways that a Custom Web Published site can solve (with PHP or any web app that can use the ODBC or XML results). More than likely if the Site Assistant was previously used, WD may be just as useful. YMMV or YKMV