Accessing from the page in LowerFrame to the page in UpperFrame causes undefined error!
<p>My website consists of two frames, let's say upperFrame and lowerFrame.</p>

<p>On the document ready of the page in lowerFrame, it access one of textbox located on the page of upperFrame.
Sometimes, since the upperFrame do NOT complete its loading, lowerFrame get the undefined while it access the upperFrame.</p>

<p>Let me know if there are Any solutions/checking to prevent this problem?</p>
