On Wed, 29 Jul 2009 02:10:27 +0900, YONETANI Tomokazu wrote:

>     try {
>       event.returnValue = 0;    // work-around for IE
>     } catch (e) {}
> 
>        return 0;
>    }

I would suggest "finally" instead of empty "catch":
     try {
        event.returnValue = 0;
     } finally {
        return 0;
     }

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