use the "image_path" helper to get a images in relative url root dir.
use the "image_path" helper to get a images in relative url root dir.

git-svn-id: 56b657077d105c6a698e341c21604e1fb36b476e@18801 ee427ae8-e902-0410-961c-c3ed070cd9f9

Symfony-Plugins/sfAdminDashPlugin,Symfony-Plugins/sfAdminDashPlugin