invalid index error in javascript
<p>we have a website where the users occasionally gets invalid index when trying to move some items from one list box to another. when we try to do the same thing it doesn't happen. so we are not sure how that is happening. It seems like the script is trying to access an element in the array that doesn't exist or something like that. Is there a way to check if the array item to avoid this error?</p>

<p>Thanks,
sridhar.</p>
