Hey. Why not try to include the css in this page too? If you use a link to include the css file in the html, it will lost after you do this.
But if you try to copy and paste all the css into that page you load from. (copy from your .css to .html), it will work.
You mean you included all the css in your new file and it's still working(Not the file you are trying to .get)? Have you tried to copy and paste all stuff from the jquery.mobile-1.0a3.min.css and paste them to the file you are trying to get?