Component that implements encryption solution between the browser and Java

I need a Component that implements encryption solution between the browser and Java tier.
I am a java programmer and have really limited knowledge about cryptography. I work on JSF . I am basically looking to build a component that will ensure that the password entered by the user in the login page of the browser is properly encrypted using Java script and then we should be able to decrypt it in the Java Tier.
Basically, I think we need a public-private key system. We send the public key to the browser and use it with JavaScript to encrypt the key and we hold the private key on the server to decrypt it.
If some one can help me with this it would be very helpful. Or if anyone can point me to some resource that does this kind of thing I shall be obliged.

Can't use HTTPs as many of our existing customers
that run on intranet do not use HTTPs.Is there really a technical reason that your clients cannot use HTTPS? If so, what is it and why would your homebrew re-implementation of the same technology be acceptable instead?

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