Determining the validity of a JavaScript parameter

I have a web page that writes a text box to the screen depending on centetain paramters.
if(ok) printf("<input type="text" name="textbox">\n");else printf("Something else");

I then wish to do something IF "textbox" is displayed. I do not then know the state of "ok" so I wish to interrogate textbox to see if it exists.

I there any way to do this in JavaScript?

TIA

<script language="JavaScript" type="text/javascript">

if (document.yourformname.textbox) {
// the text field is present
} else {
// the text field is not present
}

Quote:

---

Originally posted by websmith99
<script language="JavaScript" type="text/javascript">

if (document.yourformname.textbox) {
// the text field is present
} else {
// the text field is not present
}

---

Thanks. Doh! How easy!