You should be able to get rid of it with the following:
you need to open Internet Explorer->Tools->Manage Addons->Disable i.trkjmp.com/crossdomain.xml related addons or disable all unverified addons.
you need to open your Mozilla Firefox->Tools->Add-ons->Extensions->Find i.trkjmp.com/crossdomain.xml related extensions or disable all unverified extensions.
you need to open your Google Chrome->Wrench Icon->Tools->Extensions->Unclick the Enabled to disable i.trkjmp.com/crossdomain.xml Extension and then click the Bin button to remove it. (The extension could be called 'save as')