Sound nice? This video shows how to do it.
/documentation/pages/Guides/PhoneGap/Working with Files/PhoneGap File System Actions.xml
/documentation/pages/Guides/PhoneGap/Working with Files/File Download Action.xml
/documentation/pages/Guides/PhoneGap/Working with Files/File Upload Action.xml
/documentation/pages/Guides/PhoneGap/Working with Files/PhoneGap File System Actions (File URI Based).xml