Check if a Page is a Child of Another Page in WordPress

is_childPage

#-----------------------------------------------------------------
#	Check if a Page is a Child of Another Page in WordPress
#	Returns true if a match was found.
#
#	@param int $pageID
#
#	@return bool
#
#-----------------------------------------------------------------
function is_childPage($pageID) { 
	global $post; 
	if( is_page() && ($post->post_parent==$pageID) ) {
               return true;
	} else { 
               return false; 
	}
}