How to edit javascript in firefox 3.6

Hi friends

How can i edit the javascript in firefox 3.6. Is there any tool to edit javascript and how can i use that tool to edit javascript.

Thanks

Firebug

Thanks for the reply
I have firebug. please tell me how to use firebug to edit javascript. any document or any link.

In the HTML view you can change the markup in real time.

Hi
i m able to change the markup but not the javascript.

Hmmm. It used to let you do that. Apparently, not any longer. Sorry for the bum lead.

So any suggestion now how to do that ?

What do you mean edit JavaScript? You mean to actually code it in an editor like eclipse?

Eric

I assumed he meant on-the-fly in real time within the browser. Otherwise, yeah, a text editor.

I need to edit javascript in real time within a mozilla browser.
And one more thing i can edit the javascript with firebug if javascript is written in jsp page itself like below

<html>
<head>
<script type="text/javascript">
function message()
{
alert("This alert box was called with the onload event");
}
</script>
</head>

<body>
<input type = "button" onclick="message()">
</body>
</html>

But i m not able to edit if javascript is imported from some other location like this:-

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<script type="text/javascript" src="external.js">
</script>
</HEAD>

<BODY>
<input type = "button" onclick="message()">
</BODY>
</HTML>

please provide some suggestions