Multiple font sizes in InDesign Text box?

Is there a way to insert text with more than one font size within a single text frame using InDesign? I know how to insert text and apply a font to a text frame, but is there a way to insert more text at a different point size?


tell application "Adobe InDesign CS3"
	tell document 1
		set docInfo to "some text" & return
		set contents of text frame "DocInfo" of page 1 to docInfo as text
		set applied font of parent story of text frame "DocInfo" of page 1 to "Arial	Bold"
		set point size of parent story of text frame "DocInfo" of page 1 to 9
		
		set moreDocInfo to "some more text"
		-- ??? How do I get this to be a different point size  ???
	end tell
end tell

To add extra text, you set the contents of an insertion point. Something like:

set contents of insertion point -1 of parent story of text frame 1 to return & "Some more text"

You can change the font like this:

set applied font of paragraph -1 of parent story of text frame 1 to ...

You could also set the applied paragraph of paragraph 1 (or 2 or 3) to one paragraph style or set the applied character style of a text range to a character style.