function gook() {
	if (usernameshow.value == "") {
		alert("用户名不可为空");
		usernameshow.focus();
		return;
	}
	if (pwshow.value == "")	{
		alert("密码不可为空");
		pwshow.focus();
	    return;
	}
	f1.saveUser.value = showsaveUser.checked;
	f1.username.value = usernameshow.value;
	f1.SecEx.value = showSecEx.checked;
	f1.pwhidden.value = encode(pwshow.value, parseInt(f1.picnum.value));
	f1.submit();
}
function encode(datastr, bassnum) {
	var tempstr;
	var tchar;
	var newdata = "";
	for (var i = 0; i < datastr.length; i++) {
		tchar = 65535 + bassnum - datastr.charCodeAt(i);
		tchar = tchar.toString();
		while(tchar.length < 5)	{
			tchar = "0" + tchar;
		}
		newdata = newdata + tchar;
	}
	return newdata;
}