Glad my suggestion worked for others
Beagle, I would point out that it only "kills" Google Adsense adverts, not the "banner" type ones on PPrune !
You can use this "trick" to kill other advertising on other sites as well..... just replace the entry "pagead2.googlesyndication.com" with the address that you wish to block/kill.
One thing that I still cannot work out - is this problem a server one or have (as seems to be suggested in the techshout link above) my own PC's got a trojan? If it is here at home then I am completely unable to locate the devil using any of several anti-malware programs that I run.
Safe surfing
DD