not sure what you mean. the URL returns 200 status which means the resource does exist.
~>curl -A "" -I "http://www.topgiftssite.com/favicon.ico?id=0.547004595642902"
HTTP/1.1 200 OK
Date: Sat, 20 Jul 2013 00:08:15 GMT
Server: LiteSpeed
Accept-Ranges: bytes
Connection: Keep-Alive
Keep-Alive...