What's 'mytext'? Can you clarify what you're trying to do?
Anyway, you can simplify your epression

if NOT BETWEEN(thisform.text1.value, 1000, 99999999)
...

>
>i need to insert at mytext between 4 to 8 numbers
>as
>

>if thisform.text1.value <9999 or thisform.text1.value>99999999 &&9999 mean 3654
> erroe message
>thisform.text1.setfocus
>endif
>

>thanks