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Update window w/tabbar from Parent

Hi!
I have a text input field on page with a tabbar iframe window that I need to update from parent.
It works flawlessly in Firefox, but IE gives the following error:
"tabbar.cells(...)._frame.contentDocument' is null or not an object"

Here is my codeline:
tabbar.cells("b1")._frame.contentDocument.getElementById("myfield").value="newvalue";

Do you have any suggestions?

Hello,

try the following approach instead of one that you use:

var win = tabbar.tabWindow("b1");
win.document.getElementById("myfield").value="newvalue";

This works in IE but not firefox.
My current workaround is as follows:

   if ( tabbar.cells("b1")._frame.Document )
   tabbar.cells("b1")._frame.Document.getElementById("myfield").value="newvalue";
        else
           tabbar.cells("b1")._frame.contentDocument.getElementById("myfield").value="newvalue";

Not pretty, but it works

I'm sorry, I see that my respons was a bit hasty.
I'll try your code.
Thanks.