Obtains the height of the image stored in Rosetta's memory buffer
Usage:
imgHeight (object me)
Parameters:
None
Returns:
(integer) - the height of the image in pixels
Example:
xtRose = xtra("Rosetta").new( )
xtRose.imgOpen( "C:\windows\winnt.bmp" )
nH = xtRose.imgHeight( )
Notes: