INT 10 - VIDEO -  SELECT ACTIVE DISPLAY PAGE

	AH = 05h
	AL = new page number (00h to number of pages - 1) (see #00010)
Return: nothing
Desc:	specify which of possibly multiple display pages will be visible
Note:	to determine whether the requested page actually exists, use AH=0Fh
	  to query the current page after making this call
SeeAlso: AH=0Fh,AH=43h,AH=45h,MEM 0040h:0062h,MEM 0040h:004Eh