css not applied on dynamic pages after refresh

css not applied on dynamic pages after refresh

Hi,
actually here a problem with my website i am creating a dynamic website running on php with dynamic url using jquerymobile.
I have 4 pages
1. index.php
2. categories.php
3. sub categories.php
4. post




http://localhost/categories.php?id=categoryname
http://localhost/categories/CATEGORYNAME

http://localhost/sub_categories.php?id=$1&sub_id=$2
http://localhost/category/CATEGORYNAME/SUBCATEGORYNAME





but here i am getting a error on my website if i am open all my pages in dynamic LIKE (http://localhost/categories.php?id=categoryname)  mode then working fine but if i am open my all pages SEO FRIENDLY URL like http://localhost/categories/CATEGORYNAME then after index pages all pages do not work with css working without css.

please help me to fix this error.