js function in asp form page

Hi all!

I have an ASP search page, containing a form. On my form, I have a textbox (input type=text) representing the keyword the user entered to search for. After pressing the submit button, it displays the first 10 results. Underneath those, I have a Previous and a Next button. Now when the user clicks one of the buttons, I trigger a function (in javascript) that is supposed to set the value of the textbox, and then submit the form.

I know I can submit the form like this:
document.myform.submit();

So what I figured was that I would have to set the value of the keword like this:
document.myform.keyword = "value";
or maybe
document.myform.keyword.value = "value";

But neither of those seem to work, coz it tells me that document.myform.keyword is not an object.

Can anyone please tell me how it is supposed to be done?
Thanx!

Sorry, found it..
It turns out to be case-sensitive, so it worked when I used
document.myform.Keyword.value = "value";