[JavaScript] Focusing Form Element

Hmmm, not sure whats going atm..

I have a page with an Iframe, and inside that Iframe is a text box. When the Iframe loads, I call a function in the mainpage that sets focus to the Textbox (since that way it will try to set focus when the page has loaded?).

I call the function using,
parent.SetSendMessageFocus();

And the function is,

Code:

---

        function SetSendMessageFocus() {
                document.getElementById('sendmessage').contentDocument.frmSend.message.focus();
        }
    setTimeout(SetSendMessageFocus , 100 );

---

Apparently you need to use SetTimeOut to get focus to work properly (and it wasn't working before I added it), but now it works when everything loads for the first time, and after that it just doesn't set focus anymore.

Edit:
Ok, it appears theres something dodgy with this other piece of Javascript I have working onLoad, or perhaps I just write really dodgy PHP... Hmm! Yeah this thread can be deleted if you wishes.