[imp] Custom Login problem

[Curt LeCaptain]

On attempting to get the custom login working, I get this error:

*Notice*: Undefined index: newwebmail.itol.com in 
*/data/www/docs/newwebmail.itol.com/horde/imp/scripts/custom_login.php* 
on line *18

*How would I go about getting rid of that error message, I'm really not 
sure what this line is for:
$server_key = 'newwebmail.itol.com';

Thanks,
Curt LeCaptain