Table cell innerHTML does not refresh

Table cell innerHTML does not refresh

Does not refresh table cell innerHTML.
Detailed description:
There is AJAX shop cart, by click on "Add to shop cart" it caused AJAX-request, by finishing of which
refreshing UI (if item is new - adding new string into table, else incrementing existing item quantity).
Let cell - is object-cell of shop cart table, than refreshing of quantity of items caused by this code:
var oldItemsCount = cell.innerHTML / 1; // artificially devide by 1 to get number (not string)
oldItemsCount++; // increment quantity of given item
cell.innerHTML = oldItemsCount; // refresh cell innerHTML
The problem is visual refreshing of items quantity by this manner caused ONLY after
events like window scrolling or application focus changing. I checked validity of this code
in others popular browsers, namely, in IE (6, 7, 8), Mozilla Firefox, Safari, Google Chrome -
EVERYWHERE visual refreshing caused NOT depending on window scrolling or focus changing, immediately after
"Add to cart" button click. Only in Opera I see such strange effect. I tried to generate random string and replace
innerHTML of table cell on generated random string - in this case all works as expected.
Please, help me to solve this probles. I point one more time that this trouble is actual only for Opera, in others browsers
all works perfectly. Please, give me some solutions as soon as possible. Thanks a lot in advance !