Header background Image

Hi, I have a problem with my header background for pages. On the homepage I have this: background:url(wp-content/uploads/2013/05/textured_paper2.jpg) repeat; This works fine. But when I go to any of the other pages it looks for a different directory. For example - On my contacts page it looks for url(contacts/wp-content/uploads/2013/05/textured_paper2.jpg) How can I solve this? Thank you.