function SHA1auth(seed, doublehash)
{
	document.getElementById('login_username').value = document.getElementById('input_username').value;
	var pw = document.getElementById('input_password').value;
	
	if (doublehash)
		pw = SHA1(pw);
	
	var hashcode = pw;
	hashcode = SHA1(seed + hashcode);
	document.getElementById('login_hash').value = hashcode;
	
	document.getElementById('login_form').submit();
}