Set the cursor shape in dos mode. or video mode text or video text mode. 

Let me know if you need a sample code. send me a mail and I will send u the code. 


INT 10 - VIDEO - SET TEXT-MODE CURSOR SHAPE
	AH = 01h
	CH = cursor start and options (see #0012)
	CL = bottom scan line containing cursor (bits 0-4)
Desc:	specify the starting and ending scan lines to be occupied by the
	  hardware cursor in text modes
Notes:	buggy on EGA systems--BIOS remaps cursor shape in 43 line modes, but
	  returns unmapped cursor shape
	UltraVision scales size to the current font height by assuming 14-line
	  monochrome and 8-line color fonts; this call is not valid if cursor
	  emulation has been disabled
	applications which wish to change the cursor by programming the
	  hardware directly on EGA or above should call INT 10/AX=1130h or
	  read 0040h:0085h first to determine the current font height
	on some adapters, setting the end line greater than the number of lines
	  in the font will result in the cursor extending to the top of the
	  next character cell on the right
BUG:	AMI 386 BIOS and AST Premier 386 BIOS will lock up the system if AL
	  is not equal to the current video mode
SeeAlso: AH=03h,AX=CD05h,AH=12h/BL=34h,#2469

Bitfields for cursor start and options:
Bit(s)	Description	(Table 0012)
 7	should be zero
 6,5	cursor blink
	(00=normal, 01=invisible, 10=erratic, 11=slow)
	(00=normal, other=invisible on EGA/VGA)
 4-0	topmost scan line containing cursor