I change out the repeating image for interior content in my css code, and now for some reason the image won repeat:

I didnt touch any of the coding that was there before, so I am confused as to how this could end up not working:

#repeating-content
{
float: right;
margin: 0px 30px 0px 0px;
background: #959398 url(../site-images/repeat-content.jpg) repeat-y;
width: 662px;
}

The only thing that I changed was the .jpg file that was being used previously.
Any suggestions? Perhaps I need to change something else where