Skyone wrote:I've been stuck on 19 for hours of time...

I'm pretty sure it's impossible with what they've given you... I resorted to googling it and found some posts about people having to email the site administrator, who then gave the user the pass to level 20.
FYI, this site is the same as hackertest.net and hack-test.com. Level 19 on these other sites is a lot different, it actually contains text, supporting my theory that Level 19 on hackerskills.com was accidentally cut in half.
Anyways, level20_pass.gif is what you need, but it is different for every site, and never gives a definitive answer. Ahhh