Cast Random Mount

I heard there was a macro that would randomly cast all your mounts.

I currently use something like
/castrandom Mountname, Mountname

That type of thing. A guy in vent was saying there is an actual random mount macro because castrandom did not used to work for mounts. Alas my google-fu just turned up /castrandom macros. Does anyone know what the random mount macro is?

http://www.wowwiki.com/Mount_Macros

Thanks M8 now I can use all my mounts.