Thanks for the replies.

Just to let you guys know about my progress; mapping DIV elements with Item Ids didn't work for me. When I create a simple HTML, OverwriteTable was able to update my html page, but it wasn't able to update my DIVs when they are inside an Ext grid.

But using NonVisual table has solved my problem; I am basically refreshing my grid after each update now but I will make sure my grid only refreshes itself on some certain intervals. I will try to implement the logic of highlighting grid for changes on this interval as well. I will let you guys know about these steps..