Can't access textbox

Hi,
New to this so apologies in advance.
I am just trying to access a textbox and give it a value using this code:

Code:

---

<script type="text/javascript" language="javascript">
function FocusSelected()
{
document.getElementById('TextBox1').value = "hello"
return(true);
}
</script>

---

The problem is the text box is on a form view on a mutliview on a tab container and i think this is the reason the code does not find the text box. I get the following error: document.getElementById(...)' is null or not an object

Can anyone help?
Thanks
Mojo

If it's ASP.NET you're using, you should stick to the ASP.NET forum as it has its own 'quirks'.

In your case, I am guessing that the actual rendered ID of the textbox control is not TextBox1. Do a view source and see for yourself. You will need to generate the call to the function in the codebehind or generate the javascript in the codebehind, because that's where you have access to the .ClientID property. (TextBox1.ClientID)