[Puno]

Please, how would i check if some value is undefined?
like for example:

(document.form.textbox.value == undefined)

but correct sintax

Seems simple but i swear i have been for 3 horus at it...
thanks a lot in advance
Puno.

[addit]

Try this: (document.form.textbox.value == null)

[TwoD]

checking for null will work since undefined==null

But in my scripts I have sometimes have no problems with checking for undefined using the first example. I don't know why but in some scripts it seems to work and in some it doesn't...

All I know for sure is that it always works when you are checking to see if an argument has been sent to a function or not, like this:

function Test(arg){
if(arg==undefined){
arg="default"
}
}

[Puno]

Replying to myself to make sure I dont confuse other people checking it out.

First of all, thanks everyone for the replies, they made me realize my mistake was not there and found where the problem was.

It was a noob mistake, in the hurry and stress I was trying to access a radiobutton's value directly like so:
document.form.radio.value
This is a big no no


Remember radio buttons are in a sense at least, ARRAYS
seems to be correct:
document.form.radio[index].value

And that can be compared to undefined or null.
Yup, I noticed that to simplify I used a textbox in my example, if I would have used the radiobutton you could have told me straight where my problem (idiocy) lied.

Well, thanks a lot for your help and hope this helps more people down the line. =)

Puno.
Spectrum 48K BASIC's was cooler, it had a BEEP instruction.