debugging JSFL

[pyso]

Hi everybody,
I am starting with Flash and I need some help.

Is there any possibility to debug my JSFL code? When I need to see how my code works is very useful to process code row by row. But unfortunatelly I don't know how to do it.
And the only possibility for me is fl.trace() function and watch output window.

Thanks for any hint.
//pyso

[pyso]

Would be also interesting to know if there is any tool which can tell you on which row you have incorrect syntax.

Not just Syntax error: missing { before something
Without knowing exact location it's really difficult to fix the problem.........