Have a subdomain
Just place index.wml there which is the login screen. To really get the source of index.wml, access the long url with deckit emulator and then copy the source that you see into a file index.wml, upload that to http://wap.mysite.com
That's the way i did it. the other way around is to use a redirect script ( i think i had posted that script somewhere oin this forum by name of direct.pl or something) and then use DirectoryIndex in .htaccess file. But this could mean getting knocked off from Google (my experience)....before i switched to Subdomain option.
Here is the script: