Script Overloading issue when replacing images

Hello,

My site was blocked thrice due to script overloading when using taxonomy images.

I was replacing existing image of taxonomy term with a new one in following sequence:
1. Term open for edit
2. Check box clicked fo delete
3. New image selected by browing
4. Save was clicked
and BANG - Server blocked. It took me three attempt to realise that what the problem is. Please check and update.

Thanks

Rugman