Creating an auto-login script to website?

We have an intra-net website that requires me to enter login information every time and it's annoying.

I want to create some sort of automatic login for this website. I tried creating a two-frame website, with one page being the login page and the other being开发者_如何学JAVA my own html. In my html, I wanted to enter values to the textboxes in the other frame but got an "access denied" js error.

Any other idea?

(I know I can record a Macro, but unfortunately, can't install any third-party applications in the inner-network. I could also have used Robo-Form...).

Oh yeah, and it has to work on the worst browser ever, Internet Explorer 6...

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Maybe local html file with form that mimic login form and with autosubmit (like onload="form1.submit();"?). Than you can run this file and it will autosubmitted and redirects you where you want to go (form's action).

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A greasemonkey script might work.