string reverse.. help..

the prOgram is abOut inputting a string and then the result will be its reversed string..

for example: insecure
the result must be "erucesni"


i have my cOde belOw..

help me please..

--------------------------------------
[color=Red].MODEL SMALL
.STACK 100h
.DATA

MaxChars DB 10
NumChars DB 0
InputBuffer DB 'xxxx xxxx ' ; Room for 9 chars + CR
TextNumChars DB 'x',13,10,'$'

StringPrompt DB 'Type a line of text: $'
DisplayReverse DB 13,10,'Result: $',13,10


.CODE
start:
mov ax,@data
mov ds,ax
mov dx,OFFSET StringPrompt
mov ah,9
int 21h

mov dx,OFFSET MaxChars
mov ah,10
int 21h

mov dx,OFFSET DisplayReverse
mov ah,9
int 21h

mov si,OFFSET InputBuffer ; InputBuffer will

contain the entered characters


mov ah,4ch ; DOS terminate

program routine
mov al,0
int 21h


END start[/color]

-------------------------------

that's it..

help me please..

thanks..