what this form is ?

Hi
I planning to make my own subtitle program, but i faced 2 problems i didn't understand how to make it.
First
[img]http://im33.gulfup.com/GiGIw.png[/img]

Second, when i save\load my subtitle ((any type TXT,SRT)) it should be like this:
1
00:00:00,000 --> 00:00:01,000
Hi
Can i help you ?

2
00:00:01,001 --> 00:00:02,001
Yes

3
00:00:02,002 --> 00:00:03,002
Where can i find the axe ?

4
00:00:03,003 --> 00:00:04,003
On that side


Any advice or suggest will be very helpful for me