hey.. I too had experienced this kinda prob some time back... I dont exactly remember the syntax, but you can try adding the username and password of your windows machine into your linux machine, so that it never again asks for the pwd.

Here is the procedure(google it if not correct)

Login into RHEL machine as root, type the following commands:

useradd -a <username of windows>

<you would be prompter for the windows machine password>

<enter the pwd again>

Now run your script. Thats it... probably this might solve your prob.