Thank you deepsand. I've tried that before but no success. If I took out the the ShareThis plugin javascript, the comment fox will be fine in Firefox so I'm quite sure is the ShareThis script that causes the problem but just didn't know why.

Iany, appreciate you took the trouble to check for me. I guess the html code will be easier to solve than the ShareThis script.

Hopefully someone who encountered such problem could share how to solve it.

Many thanks in advance.

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