[Ietab] Lawson portal somehow doesn't make Login button sensitive

[Karr, David]

My company uses Lawson for time reporting.  When I use it in IE, the
login screen makes it so that the Login button only becomes sensitive
after some content is entered in both text fields (user and password).
When I use it in IETab, the Login button never becomes sensitive.  I
tried to trace back through the javascript to understand why this might
have happened, but I'm unsure what might be wrong.

The javascript on the page first makes a list of all the "text" and
"password" fields.  There is code that sets the login button to be
sensitive if all the fields are non-empty, but for some reason, it
appears that it only sets up that function to be called (on a 500 ms
timeout) if the browser is NOT Internet Explorer.  Nevertheless, when I
run it in IE, the button does become sensitive.  I don't know how it's
working in IE, or why it doesn't work in IETab.

I did verify that "navigator.appName" is set to "Microsoft Internet
Explorer" in IETab (by writing a simple html that pops up an alert with
the value).