renato molina - 2010-02-03

Hi all.
I have a problem.
I need to fill out a field, but this field has an action, to be precise, an
action "onchange" in your body. Onchange calls a request made in ajax.
I'm trying to fill this field with the method setParameter class WebForm.
So I'm using a code like this:
form.setParameter (myInput "," mycontentblablabla ");
However, I introduced an error of ECMA.

org.mozilla.javascript.EcmaError: TypeError: Can not read property "action"
from null (httpunit # 72)
at org.mozilla.javascript.ScriptRuntime.constructError
(ScriptRuntime.java: 3654)
at org.mozilla.javascript.ScriptRuntime.constructError
(ScriptRuntime.java: 3632)
at org.mozilla.javascript.ScriptRuntime.typeError
(ScriptRuntime.java: 3660) …

I need help, anyone have any suggestions? Please!
In other forums got no answers