The advertisements are controlled by 3rd parties, so x10 can't really do a thing but complain or change ad companies. However if it keeps doing this, let the staff know again and use an ad-blocking program as the ad script in cPanel is simply a JavaScript file from what I know that Adblock on Firefox for example or my Linux router's firewall will pick up and block.
For your information, when I visit cPanel I never see the ads because Firefox and my linux router filter out the ads, but I looked into the blocked content log of my router and it's showing an advertisement JavaScript file coming from
http://ads.adbrite.com referred to from cPanel.