Hi,
Copy the ASMX file to
C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\ISAPI folder.
And copy the required assembly to the GAC. Then, in your browser, try http://SITEURL/_vti_bin/ajaxws.asmx [your AJAX WebService]
Then, you should be able to reference the webservice.
Regards
Ranga
Regards Ranga www.sharepointfrontier.com