Hi,

My classifieds website has been present online since 2006, the html pages are indexed and rank as expected whereas a search on Google Images for site:example.com returns nothing & in Yahoo or Bing it returns only a few image results, 8 to 10.

Here is an example of a response HTTP headers as reported by Firebug:

Date                 Sat, 15 Jan 2011 20:38:21 GMT
Server               Apache
Cache-Control        max-age=34560000
Expires              Sun, 19 Feb 2012 20:38:21 GMT
Accept-Ranges        bytes
Last-Modified        Fri, 14 Jan 2011 21:59:16 GMT
Vary                 Accept-Encoding
Content-Encoding     gzip
Content-Length       21675
Connection           close
Content-Type         image/jpeg

What should I do to tell search engines to index my website images?

Thanks in advance.