2 Themes on one page | Buttons not always present

2 Themes on one page | Buttons not always present

First off.  New to JQM and am loving it.

FIRST QUESTION:
Is it possible to have the use of two themes on one page.  Obviously since it is a theme, I assume that once you apply it to the layout, it is set, but I was trying to 

  1. $htmlout_body .= "<li data-role=\"list-divider\" data-theme=\"c\">" . $s_time_12h .  "</li>"; 
dynamically change what theme was being used on certainly elements.  I am sure I could throw some style="" code in the line above and manipulate it that way, but would rather stick with the theme convention.

SECOND QUESTION:
I am including the JQM javascript files from JQUERY and don't have them on my local server.  I notice that sometimes when I load a page that the BACK BUTTON is present, and sometimes, it is not.

Is there anyway to guarantee that the BACK BUTTION loads 100% of the time?

You can view my application at www.tsia.com/ma to see what I am talking about.

Thanks in advance.

Jason