dom.getSelectedEditableRegion()

Availability 3.0
Description If the selection or insertion point is inside an editable region, gets the position of the editable region among all others in the body of the document.
Arguments None.
Returns An index into the array returned by dom.getEditableRegionList().
Enabler None.
Example The following code shows a dialog box containing the contents of the selected editable region: 
var theDOM = dw.getDocumentDOM();
var edRegs = theDOM.getEditableRegionList();
var selReg = theDOM.getSelectedEditableRegion();
alert(edRegs[selReg].innerHTML);