in reply to WebMail login popup
If it is using a popup window then it must be using JavaScript, in which case there are plenty of solutions on this site already.
Incidently, http://webmail.com/exchange is timing out for me. You might want to check that isn't the cause of your issues. (Assuming webmail.com is real and you didn't mean example.com)
In Section
Seekers of Perl Wisdom