Question about building a WAP site

[IQ_]

Certain sites I've noticed have some type of code so that if you visit their website via your mobile phone, it will immediately take you to their mobile friendly pages. For example, if I go to www.cnn.com on my computer, it gives me a very elaborate site, however if I go to the same address on my phone, it automatically opens as the mobile version of their site. I have tried adding a certain line in my .htaccess file that defines the mobile page as the index page...but then that messes up when it is viewed via a computer. Any help?

[nKrypteD1]

I haven't personally looked at it, but I would chanceably argue that this is a browser check, checking for the known wap browsers and then redirecting.

[IQ_]

After some research, I have found that it is indeed a browser redirct code, but I have yet to find something that works. I have seen the following code recommended several times, but when I put it into my .htaccess, I always get an internal server error message...both on my mobile and computer:

RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} “Windows CE” [NC,OR] #Windows CE and Pocket PC
RewriteCond %{HTTP_USER_AGENT} “Opera Mini” [NC,OR] #Opera Mini
RewriteCond %{HTTP_USER_AGENT} “NetFront” [NC,OR] #PalmSource WebBrowser 2.0
RewriteCond %{HTTP_USER_AGENT} “Palm OS” [NC,OR] #Eudora Web Browser for Palm
RewriteCond %{HTTP_USER_AGENT} “Blazer” [NC,OR] #Handspring Blazer Browser
RewriteCond %{HTTP_USER_AGENT} “Elaine” [NC,OR] #RIM Devices
RewriteCond %{HTTP_USER_AGENT} “^WAP.*$” [NC,OR] #WAP Browsers
RewriteCond %{HTTP_USER_AGENT} “Plucker” [NC,OR] #Plucker Offline download client
RewriteCond %{HTTP_USER_AGENT} “AvantGo” [NC] #AvantGo Service
RewriteRule ^index\.php http://www.yourdomain.com/mobile/index.html [L,R]

Any ideas?