Calling a .dll function from a html page that runs on chrome and firefox

I have a dll written in c++. now i need to call the functions in the dll from a html page.

I have done this by calling the dll in vbscript (Activex) so that i can run the only in IE.

Now i need to run this on Chrome as well as Firefox.

What i have to do, whether i have to write in javascript simply or need to develop any extensions for that ?

can anyone give a solution with a simple demo for this?

Thanks in advance.

Answer

Thanks for answers friends.

I got another solution. I wrote signed applets to call dll that runs from a html or any web application. It almost run on all browsers.