drupal_add_css help[solved]

hi guys

got a weired problem here

i have add the

stylesheets[all][] = myStyle.css to the info file for my module
and added

$module_path = drupal_get_path('module', 'mymodule');
 $full_path = $module_path .'/myStyle.css';
 drupal_add_css($full_path); 

to the function mymodule_page()

and that shows fine however when i click on any of the menu tabs at top of page it dosnt show
so i tried placing the above into the function theme_mytable but still dosnt show in firefox however all pages shows fine in IE 8 is there something i have missed here ?

TIA