Accessing Input Field Values on Tabbed Pages

I have a page in which I am trying to replicate a Windows dialog box with tabs.  On the main web page, I use the ColfFusion <cflayout type = "tab"> and the <cflayoutarea> tags to create the tabbed user interface.  The content of each tab is created in a separate .cfm file that is referenced in the source attribute of the cflayout tag.  The separate tabs each contain various input controls (text, select, list, etc.).

On the main page that lays out the tabbed interface is a button. When the button is clicked, I want to process the data that the user inputs into the controls on the tab pages using a JavaScipt function that is called by the onclick attribute.  How do I access the data values from the input controls on the tab pages?