To submit the form when the enter key is pressed create a javascript function along these lines.
function checkSubmit(e) {
if(e && e.keyCode == 13) {
document.forms[0].submit();
}
}
Then add the event to whatever scope you need eg on the div tag:
<div onKeyPress="return checkSubmit(event)"/>
This is also the default behaviour of Internet Explorer 7 anyway though (probably earlier versions as well).
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