After solving the previous levels with javascript prompt level 5 isn’t difficult to solve. Some of you might face problems in it because if you click cancel the page redirects itself, giving you no time to check out the source code. But if you are using firefox(no idea about other browsers) you can still check the source code by pressing ctrl+U while the page is loading. Just open the source code and you’ll get the answer.
var pass, i;
pass=prompt("Password: ","");
if (pass=="SAvE-as hELpS a lOt") {
window.location.href="save_as.htm";
i=4;
}else {alert("Try again");
window.location.href="abrae.htm";}
The password is SAvE-as hELpS a lOt.
Good luck!!!