For those who have Photoshop, this plugin might help when wanting to create a custom cursor. The website also has some details about the file format. Useful, if not nearby a Windows computer.
Creating a CUR file on a Mac
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Category Archives: Elsewhere on the Internet
A good read for going further
Googling for a marquee text field, I stumbled across an ActionScript blog by Jackson Dunstan, having many interesting articles about code development.