get_browser is a php function that tells what the user’s browser is capable of .
You can place php.ini in your account and add this capability. You can get the latest php.ini file for php4 from your control panel or from our FAQ pages.
Once you have placed the php.ini in the appropriate folder, please edit php.ini and uncomment this:
browscap = browscap.ini
Now you need browscap.ini which you can download from  “php_browscap.ini
Use only with PHP!” A special version of browscap.ini for PHP users only!
Please download that file, rename it to browscap.ini and place it somewhere in your account as referenced from the php.ini file.