cannot display background image using background-image:url('.....");

[vindu]

hi guys i have got a problem in designing my web pages.......
That the for example background-image:url('sun. jpeg');
is not working

Can any one help me finding out solution for this....and give more info about background tag....

[NetDynamic]

Keep in mind the url is relative to wherever the css is.. So if your css is in a css stylesheet in a subdir and you dont specify a path it wont find an image in the root dir