CSS for background image not transfering from template to new page

Question

I have a gradient .gif in my templates which suddenly no longer transfers from the template to  a new page created from the template.  Everything else about the template transfers.  I'm using Dreamweaver CS5 on a Mac running OS 10.6.  I've pasted the CSS from the template and the new page below.  I've tried the usual voodoo--restart program, restart computer, repair permissions, delete preference file, delete personal configuration file.
CSS from Template:
.container {
    background-color: #ececec;
    background-image: url(../images/faux_column.png);
    background-repeat: repeat-y;
    height: 650px;
    width: 650px;
CSS from page created from Template looks to be the same, but is greyed out in the code, and the background-image entry is not present in the CSS styles inspector:
.container {
    background-color: #ececec;
    background-image: url(../images/faux_column.png);
    background-repeat: repeat-y;
    height: 650px;
    width: 650px;
Any suggestions greatly appreciated.

Answer 1

Unfortunately, I don't yet have a site where I can post the page.  I'm new to this, and doing everything locally for now.
After careful rechecking, I found that the links for the template and the child were not the same, as you suspected.  So I carefully changed the links to site root relative, which worked for the background CSS in my test image.  I then did the same for all of the links to pages on my site, and checked that all were OK with Link Checker in DW.  I guess that was a mistake, because now most of them don't work when tested in Firefox--I get the message File not found.  Must be doing something wrong.