How to provide javascript implementation in java

hi all
I am workiing in a project where i need to automate the javascript processing from java.
suppose if a page has load event and it has some function to do , from java i need to do the functionality for javascript and generate a new DOM for the webpage.
In this i need to provide the functionality for
document.write()
how to provide the write functionality from java.
suppose
<form>
docuement.write("some thing do tadd in form may be some html code");
</form>
so how can i add this content in write to a element called FORM and if a page has many forms how to add it to specific one.
waiting for some hints
thanking you

try this link
http://java.sun.com/products/plugin/1.3/docs/jsobject.html
import netscape.javascript.*;
import java.applet.*;
import java.awt.*;
class MyApplet extends Applet {
     public void init() {
         JSObject win = JSObject.getWindow(this);
         JSObject doc = (JSObject) win.getMember("document");
         JSObject loc = (JSObject) doc.getMember("location");
         String s = (String) loc.getMember("href"); // document.location.href
         win.call("f", null);                      // Call f() in HTML page

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