i am in the process of create data forms, but i need to be able to hide forms in the back ground of the main form and then show the relevant form depending on the answer by the customer, example user chooses A so this shows form C, if the user choose B it shows D, but it is difficult as the instructions are quite complex to understand how to do it.

xxforms:script is a good way to put javascript code in a clear way. But if you put a xxforms:script in an event xforms-ready, Orbeon don't execute or call the script.
For example:
<xforms:model ...>
...
<xxforms:script ev:event="xforms-ready">
alert("The xforms is ready!");
ORBEON.xforms.Document.setValue("foo", 42);
</xxforms:script>
</xforms:model>

This problem was informed in bug #306043 on 2006-08-24!! See details on following link:

http://forge.objectweb.org/tracker/index.php?func=detail&amp;aid=306034&amp;group_id=168&amp;atid=350207

But for a better and complete solution, the xxforms:script would execute under all types of ev:event.

I am going through your User Guide and come across some inconsistencies.

For example. The image shown at the end of paragraph 5.8. Finishing-Up the Controls shows a Save button. This button cannot be seen yet, because the next paragraph explains how to add the Save button.

Also, paragraph 5.10. Loading the Initial Data contains an error in the definition of the xforms:submission element. The attribute serialization="none" should be serialize="false".

Hope that helps.