See http://sitecheck.sucuri.net/results/poker.bet365.dk/extra/da/poker-guides/getting-started
The two sites 'http://poker.bet365(.)dk' and 'update.dk.p365update(.)com' have not been evaluated by SiteAdvisor. The site status for both of these is 'Unknown'. They should both have been submitted by the site owner for full testing.
Any warnings for these URLs are therefore being generated by TrustedSource, which uses real-time feedback and third-party input to notify users of suspect or dangerous sites.
In the case of pokerbet365 it may be that the site's use of WebResource.axd and ScriptResource.axd is causing a problem.
A web resource is a file embedded in an assembly
That implies the file is compressed, probably packed. That looks like malware to an anti-virus program.
Same thing goes for ScriptResource.axd -
- Automatically GZip/Compressing your scripts over HTTP for delivery.
- Dynamically resolving Release/Debug scripts based on build parameters. This is useful, if you keep two types of the same script: one for debug, and one packed for release.
Compressed, packed. Both of them attributes of malware.
The handler's "streaming" the javascript files to the client dynamically
So the server is creating javascript files dynamically at run-time on the client PC. This is likely to cause problems wth real-time antivirus scanning programs.
If you are convinced these sites are safe you can contact SiteAdvisor and/or TrustedSource (see this document), but the sites will still need to be tested properly.
For information about this use of .axd files in ASP.NET :
http://bchavez.bitarmory.com/archive/2008/07/28/understanding-scriptresource-and-webresource-in-asp....
http://blogs.msdn.com/b/carloc/archive/2008/12/04/webresource-axd-or-scriptresource-axd-not-working....
http://forums.asp.net/t/1258729.aspx
http://forums.asp.net/t/1258715.aspx
http://weblogs.asp.net/scottgu/archive/2010/09/18/important-asp-net-security-vulnerability.aspx