Arun,

 

Firefox do not support input.click() method.

 

It require the user click that button.

 

gmail.com does the same thing.

 

-

 

You can try two way to improve it :

 

1. server side if(isfirefox)uploader.UploadType="Flash" , force the users install the Flash

 

2. set ShowFrameBrowseButton to true , and try it.

 

Regards,
Terry