style square images aren't reloaded firefox safari


we have found out firefox (at slightest v3) safari don't morally cache images referenced css file. images cached, nonetheless never refreshed, even change server. once firefox settlement cache, never check changed.



our css record looks this:



div#news {
  background: #ffffff url(images/newsitem_background.jpg) no-repeat;
  ...
}


the problem change newsitem_background.jpg image, firefox users still aged image, unless definitely modernise page. ie hand, detects settlement altered reloads automatically.



is famous problem? any workarounds? thanks!



edit: fortitude press f5. i this. nonetheless the clients only revisit the web site, old, prehistoric graphics. know need press f5?



i have hallowed firebug reliable i already suspected: firefox only doesn't even try collect images referenced css file, out have changed. press f5, does check images, web server simply responds 304, solely those have changed, where responds 200 ok.



so, there proceed provoke firefox automatically transform an settlement referenced css file? definitely i'm wholly problem?



edit2: i tested localhost, settlement response doesn't enclose any caching information, it's:



server  microsoft-iis/5.1
x-powered-by    asp.net
date    tue, 14 oct 2008 11:01:27 gmt
content-type    image/jpeg
accept-ranges   bytes
last-modified   tue, 14 oct 2008 11:00:43 gmt
etag    "7ab3aa1aec2dc91:9f4"
content-length  61196


edit3: i've finished some-more reading looks only can't fixed, given firefox, many browser, only assume an settlement doesn't change unequivocally mostly (expires header all).



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