Login Page Problem

[Ramesh Etta]

Hi,

i had written a login page in jsf with fields UserName and Password.
Now i had two buttons named Login and Clear.
When i enter username and password values and press enter key nothing is happening. i mean the submit is not happening. but when i press the login button it is being submitted.

Now i want like after i enter password and press Enter button, the submit needs to happen.
Please help me in this matter.

here is the login page jsf code:

<ice:form id="mainFrm" >